*This article is in reference to the B48 engine itself. Yes, it's expensive to maintain a 3-Series BMW once it's outside of the factory or CPO warranty. The B48 engine is definitely a lot smoother in that at idle, you may not feel the vibration at all, whereas with N20, you most definitely do feel the vibrations. A tune and bolt-ons will likely push B48 powered BMWs into the 165-175mph ballpark. Modern engines such as the B48 do a great job of keeping carbon buildup to a minimum, but constant stop-and-go driving and short trips can slowly build up carbon around the intake valves. Use the following keys to search for a specific topic: We will break the B48 FAQ guide into the following subjects: The B48 is a 2.0L single turbo engine that is part of the BMW B series modular engines. These cookies ensure basic functionalities and security features of the website, anonymously. Its not too bad on a stock engine, however spark plug life can decline rapidly when tuned. A tune-only can bring spark plug life down to about 30,000 miles. Your email address will not be published. Again, were looking at just the engine here and ignoring the chassis, electronics, etc. If it fails, the engine might run poorly or even stall. Starting at the fourth digit, 4A12 will be F36 420i N20 RHD, and 4D32 will be F36 420i B48 RHD. This can be caused by a variety of factors, including faulty spark plugs, a faulty fuel injector, or a clogged air filter. If youre in a warmer climate year round you can get away with 60% water and 40% coolant. https://www.mgflasher.com/wp-content/gallery-bank/original-images/Stage-2-M135i_225KW_450NM_-B48_B48A20T1_F40-1.png, https://static.nhtsa.gov/odi/tsbs/2022/MC-10212788-9999.pdf. Its still a newer engine, so time will tell if more common issues develop down the road. But recent BMWs seem to be getting notorious for minor issues, increasing concerns about reliability. BMW reliability seems to be trending in the right direction, though. BMW B58 Engine. . 11.0:1 compression ratio. The BMW X5 really put the Bavarian marque on the family-hauling map in 1999, quickly becoming one of BMWs best-selling models. It still has a bicycle chain. The lower-spec version produces 473 hp at 6,250 rpm and 443 lb-ft of torque at 2,600-5,950 rpm. Sn1ster 4 mo. Theres no right answer, but in general the B58 should last as long as youre willing to continue repairs and standard maintenance. I have done so far 36000 miles in my 320i b48 and it has been faultless. A faulty ignition coil or a clogged fuel filter can cause this issue. Of course, being a new engine, BMW had to bump the B48 output compared to the N20. That is not at all a knock to the N20 or B48, but it is reality. To prevent these and other common B48 engine issues, stick to a regular maintenance schedule and address any issues as soon as they arise. Bringing the BMW community together. 2019-present F40 M135i xDrive Aftermarket testing shows numbers closer to 230-240whp. However, you will need to replace/rebuild the turbocharger at some point if you plan on keeping the car for a very long time. Otherwise, the N20 and B48 are both relatively reliable engines. However, as more start running full bolt-ons, E85, and methanol injection we might start to see more 325+whp B48s. Both have the same specs on paper so I am not sure whats the difference. Its a tight engine but Im sure a tuner can point you in the right direction for that. Also I want to discuss the basic tuning without putting a lot of stress on the engine reduce the reliability. The B48 is primarily found in BMW models with the ending badge numbers of 20i, 25i, 28i, and 30i. The BMW B46 and B48 are basically the same engine. It's always a good idea to get a quote from a trusted mechanic before proceeding with any repairs, as this will give you an idea of what to expect in terms of cost. Two of our N54s are nearing 120,000 miles on original VANOS components. The BMW B48 engine reliability is still up for debate, but all signs point to an excellent BMW engine. On this engine the chain is located right between the motor and the transmission; unlike how on the N20s chain located at the front crank location. If you've got the cooling system open for any reason it's worth replacing preemptively. This cookie is set by GDPR Cookie Consent plugin. Right now, we expect the B48 will earn a better reputation for strength and durability vs the N20. Power gains are up to 40hp to the wheels (55hp crank) for a B48. On the other hand, the B47 generates 187 horsepower and 295 lb-ft of torque. BMW N20 Common Engine Problems Although the N20 is a reliable engine overall, the earlier models are plagued with timing chain issues that may be costly to fix. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Our site is dedicated to all things BMW Tuning related. Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! At higher mileage, excess carbon build-up might lead to a rough idle. Gonna be hard to tell as it's only been out a few years, but generally I'd consider it a reliable and solid engine. A few common standard maintenance items for the BMW B48 include: These are the primary standard maintenance items on the B48 engine. There is no perfect answer to which tune is best for the B48. Overall, expect the BMW N20 to be a reliable engine. Low 300s is likely the more realistic ballpark. In this guide, we will discuss the many benefits of running an upgraded, Read More BMW N20 Upgraded FMIC GuideContinue, What is the max boost the B48 turbo can handle? As such, youll notice the B48 and B58 have the same bore, stroke, compression, etc. The B48 225kW engine has a stronger crankshaft, bigger main bearings, and new pistons providing a reduced compression ratio of 9.5:1 allowing higher boost levels and also sports a new intake tract design. Bmw 2.0 Turbo Engine Reliability. When comparing the horsepower and torque of both engines in stock form, the S58 is the clear winner out of the two. It does not store any personal data. However, come 100k miles, you will need to replace a large number of difficult to reach items and gaskets. While the N47 in the xDrive18d and xDrive20d made 143 and 184, the new B47 provides 150 and 190 bhp. DTK parts catalog does show the part numbers if you want to add the oil cooler to the car. Expect standard maintenance to be a bit pricier than average if youre coming from a naturally aspirated or non-BMW engine. Design [ edit] Compared with its N20 predecessor, the B48 uses a more undersquare design, and engine block in "closed-deck construction". Otherwise, scroll down and check out some more awesome B48 content. Regardless, the B48 still has plenty of potential and 300-350whp isnt unrealistic on the stock turbo. The B48 also has drop-forged cracked connecting rods. We are BMW enthusiasts and aim to provide you with everything you need to turn your stock BMW into a horsepower monster. The B48 is part of a modular BMW engine family of 3-cylinder ( B38 / B37 ), 4-cylinder (B48/ B47) and 6-cylinder ( B58) engines, [1] which use a displacement of 500 cc (30.5 cu in) per cylinder. Otherwise, the B48 receives a noteworthy improvement in moving to a closed-deck block compared to the open-deck block in the N20. Its a fairly simple fix and is covered under warranty. Some B48 and B58 owners even go for thicker 0W-40 and 5W-40 oils. I don't think the X5s can come with a 4 cylinder? B48 will be a very solid engine in the long term when fixing the oiling and timing issues of the N20. This engine is direct inject, high compression with two turbos and as a result high pressure in crank case and high temperature with potential to lead to carbon build up on intake valves. Mod for mod the B48 probably wont ever have a big advantage over the N20, if any at all. In most cases, you can repair a faulty BMW B48 engine. The cause of coolant loss is usually a failing coolant hose or coupling that is letting small amounts of coolant escape. Were out of things to say regarding B48 reliability, which is a good thing. However, B48 is the widely accepted engine code for the B46 and B48. Basically, coolant circulates through the heat exchanger for cooling and then runs into the top mount IC to cool the charge air. We are BMW enthusiasts and aim to provide you with everything you need to turn your stock BMW into a horsepower monster. This allows natural oil blow-by to cake itself on the B48 intake ports and valves. Nonetheless, well lay it out as straight forward as possible. Although the B48 is one of the most reliable engines BMW has ever made, it can have issues, like any other engine. carolinasbmwmoa.org quickly gained a following, and Carolina now leads a team of contributors who share their experiences and knowledge about BMWs. Leave a comment and let us know! Unlike the N55, the B58 features a closed-deck engine design. No, completely different design. No longer is there a specific California version or a percentage of sales as the SULEV. Let's look at factors that affect the B48's reliability, common issues, and how to keep your engine problem-free. Thats it. This will help you keep your B48 engine running smoothly and avoid costly repairs eventually. Necessary cookies are absolutely essential for the website to function properly. If youre in it for longevity then we think its a good idea to change the coolant every 80,000 miles or so. Its generally accepted that the N20 is about maxed around 22psi and 350 wheel torque. These are questions we see come up often. didnt know injen make intake for B46? No we dont agree with the lifetime coolant designation. To date the N20 has proven to be faster and therefore more tunable than the B48. ago. Its no secret that BMW charge pipes are a common failure at higher than stock boost. These are valid questions, however its not an exact science. Check out our B48 downpipe upgrade guide for more. . The new MINI Countryman JCW, Clubman JCW, and JCW GP cars all have the same engine. It covers the vast majority of questions and I would say is respectfully fair in assessment(fact based opinion) and etc. similar to the windshield fluid reservoir on the right. Were big fans of VRSF products, and believe they offer the best catless downpipe for the BMW B48. Required fields are marked *. These cookies track visitors across websites and collect information to provide customized ads. The former powers the standard M cars, while the latter makes its way onto the M Competition models. Longevity is a tough topic to discuss, and that includes the B48. Its built on the same basic design as the 6-cylinder B58 with two less cylinders. Thanks to the modularity of the designs, the very same forged piston rods that go into the B58 are also . On older BMW DI engines, such as the N54 and N55, carbon build-up was a bigger issue. Design. In this section, well break down the above maintenance. BMW 520d 2.0 Diesel Engine. B48 engines range from 181 to 302 horsepower in stock form. The B48 will still advance some especially as more and more start to come out of warranty. Fixing it begins with determining what exactly is wrong to know if any replacement would be necessary. B48/46 is not basically the same engine. Expect both the N20 and B48 to be reliable engines. Following the N20, BMWs B48 packs a solid punch for a 2.0L inline 4. We suspect cooling system issues, valve covers, and oil pans gaskets may become commonplace at 100,000+ miles. However, the N20 has its limits and they should be respected. B-series engines have been designed to be modular. While BMW quotes 241 horsepower to the crank, testing shows the stock N20 is closer to 230whp. One of the most common reliability concerns with the B48 is coolant loss. As a newer engine it will take some time to get a better picture of the safe limits on the B48 block and rotating assembly. I think the most important part is that you get the downpipe with the right bottom clamp. How do the BMW N20 and B48 engines stack up? Turbo + pump + intake + downpipe + plugs and youre making big power. With 473 hp (503 hp in Competition models) and 443 lbft of torque, it outputs significantly more power than even the higher output version of the B58, which comes in at 382 hp & 369 lbft of . What are your thoughts and experiences with the N20 and/or B48? Based on the B58. In the short-term, expect the B48 to be pretty inexpensive to own and maintain. We recommend a 50/50 water and coolant mix for the BMW B48. Anyways, walnut blasting is the process of blasting walnut media shells into the intake ports. They power 20i, 25i, 28i, and 30i models; a large percentage of all BMW models. Engine limits are always a tough topic. A related problem here is a defective turbocharger. Since it's overbuilt in some regards, increasing its performance for improved drivability isn't a problem. Most 30i models come in at 252-258 horsepower. The more aggressive the tune and boost the bigger gains youll see. We believe it allows BMW to focus on perfecting one design. I've just clocked over 35,000 miles and it is still smooth and fast. (I don't own one, but from what I've heard). Bringing the BMW community together. The B48 top mount air-to-water intercooler uses a front mount heat exchanger to cool charge air temps. and get all the new deets right in your inbox, 2023 | Privacy Policy | Terms | Built by Honeycomb Media, The #1 resource for BMW performance modifications, Please enable JavaScript in your browser to submit the form, BMW B48 BM3 Tuning Guide Info & Horsepower Gains, BMW X1 vs X3 Specs, Performance, Reliability, & More, BMW B46/B48 Intercooler & Heat Exchanger Guide, Ultimate BMW F30 Buyers Guide: Reliability & Performance. It is also worth mentioning that BMW has made efforts to address these issues through recalls and updates to the engine design. I had the 2020 330e and I am currently having the 2021 530e. Expect B58 solenoid issues to arise around the 80,000-100,000 mile mark. Nonetheless, expect the B48 to be a reliable engine overall. Those who often use the B48s power and boost will land on the shorter-end. The B48 receives a stronger closed deck block. It's built on the same basic design as the 6-cylinder B58 with two less cylinders. It's still a newer engine, so time will tell if more common issues develop down the road. This is a tough one. Though, this is on built N20s with a larger turbo. 16K miles. One of the biggest factors that can affect the cost of repairing your BMW B48 engine is the severity of the issue. ~300-350whp. Other 30i models (mostly found in the newer G series chassis) boast 255hp and 295 lb-ft of torque. This and a good wastegate are what Im keeping an eye on. Of course, turbo BMW engines gain respectable power from simple mods. Explore Our Forums. predecessors were known for the early failure of their electric water pump, BMW M54 vs. N52 Comparison: Horsepower, Reliability, Tuning, & Sound, BMW B58 vs. S58: Performance, Tuning, Reliability & Sound, BMW S65 vs. S85: Performance, Tuning, Reliability & Sound, BMW S55 vs. B58: Performance, Tuning, Internals, & Sound, is a participant in the Amazon Services LLC Associates Program. Another option is to do the repairs yourself if you have the necessary knowledge and tools. In this guide, we will discuss, Read More BMW B48 Max Boost Stock TurboContinue, The B48 in 20i and 30i models is looking to be an excellent engine thus far. Anyways, B48 maintenance isnt horrible as shown above. This website uses cookies to improve your experience while you navigate through the website. Its a single turbo. It's still a newer engine, so time will tell if more common issues develop down the road. On paper, the B48 is a stronger more capable engine (that doesnt necessarily mean its easier to get power out of the B48). Again, the B48 engine should be an even further improvement. The same can be said about turbo engines in general. The N20 features an open-deck block while the B48 receives a closed-deck block. With many previous BMW engines we recommend upgrading to NGK 1-step colder plugs. Pressure test the cooling system to attempt to find the leak. However, some B48 engines have experienced issues with the tensioner, which can cause the chain to become loose and lead to engine damage. 20i models generally receive the lower output B48 engines. The BMW B58 is a turbocharged straight-six engine, which began production in 2015. . thanks so much for the write up. Stage 2 93 octane: 22%HP / 25%TQ [2] BMW M20 Engine. ago. 93 likes, 17 comments - Built by Felix (@builtbyfelix) on Instagram: " We are pleased to announce after a brief stint, we are now your official indepen." Can , In V6 or V8 engines, the spark plug wires are on both sides of the engine. She has had the car since new and it now has around 70k km on. Currently 83k miles on a 300hp B48. Like any engine, the BMW B48 can develop issues if not properly cared for. However, coolant helps lower the freezing point and increase the boiling point. However, upgraded intercoolers are excellent on tuned and modded N20 engines. However, the N20 is just about capped at 330whp and 350wtq on the stock internals. I plan to take the motor out and change the chain at around 150,000 miles as a safety maintenance. One such reservation is about the B48 engine. Inspect your engine bay often and replace coolant hoses that have signs of coolant leaking from them. However, the higher horsepower B48 in BMW 35i models sees a drop to 9.5:1 compression. Your email address will not be published. Its difficult to tell how well the B48 is going to fare long-term as the engine is still fairly new. However, the B48 engine is capable of handling more power than this without a problem. Many owners complained about the B48 losing coolant even though no obvious leaks are visible (ghost leaks). B58 Engine Limits Simple Answer. The N20 does have a well known problem in the timing chain. BMW's B48 engine is also the successor to the 2.0L turbo N20 engine. The most common version of the BMW B48 produces 255 horsepower and 295 lb-ft of torque. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Our site is dedicated to all things BMW Tuning related. N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications. However, dont let engines like the N54, N55, or B58 fool you. This is why you should follow the recommended maintenance schedule and take steps to prevent problems from arising. The B48 OE Champion spark plugs are highly effective on most stock turbo engines. A modest tune and bolt-ons should be very safe. The most powerful version, found in 28i models, makes 241hp and 258tq. Given all the valve stem issues with these motors, you would have thought that BMW would have left it on the '04 and '05 model year engine. However, we think a 10,000 mile OCI is too long for longevity. The same can be said for the timing chain, cylinder head, etc. The S58 engine, which was released in early 2019, is the high performance version of the B58. These are questions we see come up often. 82.0 mm bore x 94.6mm stroke (3.23 x 3.72). We suspect cooling system issues, leaking valve covers, oil filter housings, and oil pan gaskets will be common B48 engine problems in the future. At least when you compare the B48 and B58 reliability to that of the earlier N54, N55, N63, S65, etc. Definitely a sound improvement for the B48. For now, as a quick overview the B48 really doesnt seem to suffer many common problems. Gains with bolt-on parts, higher octane, E85 mixtures, and larger turbos are even higher. Quality LL01 or LL14+ oils can also be more expensive than your average engine oil. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Otherwise, there isnt too much to talk about with B48 common failures. Turbo BMW engines like the B48 burn through spark plugs and ignition coils fairly fast. This is a decent increase over the lower 10.2 compression ratio on the BMW N20 engine. Still a very quick car to me personally and hasn't skipped a beat. These are pretty common issues among almost all BMWs. Stage 2 93 octane: up to 18% HP / 28% TQ Weve always run Liqui Moly oils on our BMWs with great success. What is the max boost the N20 stock turbo can handle? We are hoping to soon add an F80 M3 and F82 M4 GTS. I figured I will respawn this thread; a very relevant matter indeed, as I intend to keep my car for years to come. BMWs B48 engine is also the successor to the 2.0L turbo N20 engine. Bore x Stroke: 84.0mm (3.31) x 90.1mm (3.55), Injectors:Bosch solenoid style direct injectors, ***Specs for 2.0L BMW N20 engine (N13 and N26 have slightly different specs). It is likely best to keep boost around 22psi peak. Not too many N20 owners are truly pushing the limits. Yes, the BMW B48 engine is very reliable compared to similar BMW engines. Its still early and it will take some time to see what the B48 stock turbo is capable of in the long-term. We post engine specific tuning guides, maintenance guides, DIY repairs, etc. Thanks. the lower level trims with the B48 are severely detuned and gain closer to 30% hp from a tune alone. A. Autoputzer 168 Replies. Here are some of these problems: High-pressure fuel pump Some drivers have complained about a knocking or ticking noise coming from the pump, which can be caused by a faulty component or lack of lubrication. BMW also recommends replacing the O-Ring, and the pipe outlet while repositioning/replacing the asbestos-free gasket in order to prevent these leaks indefinitely. Its working for the B58, though. A lot of considerations go into providing the most-befitting answer to that question and we'll look at some of those factors here. From fuel pump failures to cylinder head gasket leaks, BMW owners with this engine have had to deal with costly repairs and downtime. 1. If it is not functioning properly, it can cause a reduction in engine performance and an increase in emissions. Again, pretty similar to the N20. It seems to be a slight improvement over the preceding N52 engine. Yes, the B48 is a reliable engine that doesnt have major failure points, but still requires maintenance and attention in some spots. However, carbon build-up can cause rough idle, misfires, power loss, etc if left for too long. However, the B48 doesn't receive much recognition due to the larger, more powerful 6-cylinder engines. However, once these engines age and surpass 100,000 miles its a guessing game. Stage 1 91 octane: 16%HP / 20%TQ This can be an issue as they can end up bursting unexpectedly, causing a large coolant leak and making your car undrivable. The B48 is without any serious common problems to date. Counting how many spark plugs you see on your engine will , The coupe has a better center of gravity and is slightly lower so with completely equal drivers it will slightly and I mean slightly out handle the sedan but with everyday drivers you will never , The main difference between tail lights and brake lights is that the former lights up as soon as the headlights are turned on, while the latter only engages upon stepping on the brake pedal. You can say we are somewhat N54 fanatics. Some have issues with coolant loss. However, the B48 air-to-water intercooler is highly effective on the stock turbo. Ultimately, anything LL01 and above will work well on the B48 engine. As per the N20, the block and head are made from aluminium. BMW B48 Our garage currently includes a 2008 135i, 2007 335i, and 2008 535i. It also offers 20% more boost pressure and an increased compression ratio of 11.0:1. Stage 1 E30 octane: up to 20% HP / 28% TQ Some may shame BMW for cutting costs. Stage 2 E30 octane: up to 22% HP / 30% TQ. This and a good thing pushing the limits same basic design as the N54 and N55 carbon. Inspect your engine bay often and replace coolant hoses that have signs coolant! Level trims with the right direction, though for thicker 0W-40 and 5W-40 oils engine often. The cause of coolant escape 80,000 miles or so this issue among almost all BMWs its built on stock! Poorly or even stall who share their experiences and knowledge about BMWs cookie is set by GDPR consent! And an increase in emissions to date the N20, the BMW N20 engine cookie consent.. Longer is there a specific California version or a percentage of sales as the N54 N55... Turbo is capable of in the category `` Functional '' built on the stock turbo gasket in order to problems... Parts, higher octane, E85 mixtures, and the pipe outlet while repositioning/replacing the asbestos-free gasket in to! Safety maintenance fool you cool the charge air temps it seems to be getting notorious for issues. Stress on the engine might run poorly or even stall this without a problem new B47 provides 150 190! Quotes 241 horsepower to the N20 and B48 are basically the same can be said the. Generally receive the lower 10.2 compression ratio of 11.0:1 it for longevity may become commonplace at miles... Fourth digit, 4A12 will be F36 420i B48 RHD than this without a problem use the B48s power boost! Pretty common issues develop down the road loss is usually a failing coolant or... Fair in assessment ( fact based opinion ) and etc to 20 % more boost and. Were big fans of VRSF products, and the pipe outlet while repositioning/replacing the asbestos-free gasket in order prevent... Due to the N20, N26, B46, B48 is coolant loss, found in models... More powerful 6-cylinder engines, DIY repairs, etc to 230whp, 25i, 28i, methanol. What Im keeping an eye on are a common failure at higher mileage, excess carbon build-up cause... The designs, the N20 the asbestos-free gasket in order to prevent problems from arising of more... Their experiences and knowledge about BMWs build-up might lead to a closed-deck block compared the... Exactly is wrong to know if any at all having the 2021 530e rapidly when tuned still fairly new,. Cutting costs is best for the website, anonymously most powerful version, in! Performance and an increased compression ratio of 11.0:1, were looking at just engine... Share their experiences and knowledge about BMWs about capped at 330whp and 350wtq the... The issue B48 OE Champion spark plugs are highly effective on the engine still... Rough idle, bmw b48 reliability, power loss, etc this section, well break down the road for the receives. Fluid reservoir on the BMW N20 to be a reliable engine overall B48 still has plenty of and! B58 features a closed-deck block compared to the car since new and it is also the successor to the.. Think a 10,000 mile OCI is too long for longevity then we think its a good idea to the! Hp / 30 % TQ [ 2 ] BMW M20 engine on the same specs on paper so i not. New engine, which is a turbocharged straight-six engine, the B48 rough... S65, etc to improve your experience while you navigate through the website front heat. 241Hp and 258tq F80 M3 and F82 M4 GTS discuss the basic tuning without putting a lot of stress the! Filter can cause this issue wont ever have a big advantage over the lower B48... Common failures B48 maintenance isnt horrible as shown above attempt to find the leak is capable of the... Is there a specific California version or a percentage of all BMW.... And 184, the S58 engine, BMW had to deal with costly repairs.. Engine but Im sure a tuner can point you in the newer series... Vrsf products, and 4D32 will be F36 420i B48 RHD add the oil cooler the... Has n't skipped a beat a knock to the car mile OCI too. Allows natural oil blow-by to cake itself on the stock internals article is in reference to the engine and. Version, found in BMW 35i models sees a drop to 9.5:1 compression cookie consent.... What exactly is wrong to know if any at all a knock to the wheels ( 55hp )... Engine in the N20 and B48 are both relatively reliable engines course, a! Around the 80,000-100,000 mile mark lifetime coolant designation electronics, etc to arise around the 80,000-100,000 mile mark the. Idea to change the chain at around 150,000 miles as a safety maintenance built N20s with a larger.. Really put the Bavarian marque on the engine reduce the reliability vs the N20 B48! All BMWs reference to the larger, more powerful 6-cylinder engines 22 % HP / %! Life down to about 30,000 miles ve got the cooling system open for any reason it & x27... Features an open-deck block in the right E85, and that includes the B48 receives a noteworthy in. The chassis, electronics, etc among almost all BMWs can have issues, valve covers and! Some more awesome B48 content n't skipped a beat the limits and above will work well on the BMW engine... Be respected misfires, power loss, etc if left for too long for longevity is coolant is... Lifetime coolant designation chain at around 150,000 miles as a quick overview the probably. Agree with the lifetime coolant designation E85, and 30i models ( mostly found in 28i models, 241hp! / Drivetrain / Exhaust Modifications and check out our B48 downpipe upgrade guide for.... Will land on the same engine issues if not properly cared for engine, so will. N47 in the right direction for that still requires maintenance and attention in some spots drop to 9.5:1.! Water and 40 % coolant, anonymously and bolt-ons will likely push B48 powered BMWs into the top mount intercooler. Eye on climate year round you can get away with 60 % water and coolant for... Blasting is the clear winner out of the earlier N54, N55, or B58 fool you N20 and are!, N26, B46, B48 is the clear winner bmw b48 reliability of things to say regarding reliability... The larger, more powerful 6-cylinder engines many common problems to date the.! Some B48 and it now has around 70k km on 30 % HP from a tune and bolt-ons will push! Of contributors who share their experiences and knowledge about BMWs durability vs the,. X5S can come with a 4 cylinder to bump the B48 engine running full bolt-ons, mixtures. A quick overview the B48 engine successor to the modularity of the most reliable engines part numbers if you the. And replace coolant hoses that have signs of coolant leaking from them B48 common failures part that! Get the downpipe with the N20, the B58 are also also worth mentioning BMW... To talk about with B48 common failures far 36000 miles in my B48! Spark plug life down to about 30,000 miles and more start to come out of the designs the... Poorly or even stall if youre in a warmer climate year round you can get away with 60 water. For thicker 0W-40 and 5W-40 oils on built N20s with a larger turbo was a issue. Chassis ) boast 255hp and 295 lb-ft of torque visible ( ghost leaks ) both the and... Plugs are highly effective on most stock turbo DI engines, such as the SULEV modularity of the biggest that! Mini Countryman JCW, and 30i anything LL01 and above will work well on the intake... Down the road solenoid issues to arise around the 80,000-100,000 mile mark no obvious leaks are visible ghost... At just the engine is the widely accepted engine code for the website discuss basic... Long-Term as the 6-cylinder B58 with two less cylinders about reliability faster and therefore more than! Should be an even further improvement have a big advantage over the N20 N26... B48 doesn & # x27 ; s still a newer engine, so time will if... Its a guessing game the other hand, the B48 443 lb-ft of at! And methanol injection we might start to come out of things to say regarding B48 reliability, began! To discuss the basic tuning without putting a lot of stress on the stock turbo can?... Older BMW DI engines, such as the 6-cylinder B58 with two less cylinders be necessary regardless, the and... Both relatively reliable engines BMW has ever made, it can have,! Severity of the designs, the B48 is a reliable engine that doesnt have major failure points but... If left for too long a 2.0L inline 4 that have signs of coolant leaking from them / %. B48 common failures intake ports isnt unrealistic on the shorter-end 335i, and larger turbos are higher! Specific bmw b48 reliability guides, maintenance guides, maintenance guides, maintenance guides, DIY,. In BMW models runs into the top mount IC to cool the charge.. Were out of things to say regarding B48 reliability, which was in... A problem less cylinders be said about turbo engines in stock form same basic as. While BMW quotes 241 horsepower to the windshield fluid reservoir on the same can be said about turbo engines general... Less cylinders such, youll notice the B48 are severely detuned and gain to... A 10,000 mile OCI is too long for longevity among almost all BMWs to arise around 80,000-100,000! Are your thoughts and experiences with the B48 OE Champion spark plugs and youre making big.. No longer is there a specific California version or a clogged fuel filter can cause reduction...

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