05-12-2017, 06:39 PM | #1 |
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Difference between B46 and B48?
What are the differences between the B46 in the 2 series and the B48 in the 3 series? I read that the B48 put a couple of critical components like the VANOS and timing chain at the back of the engine. And if either ever needed work it would require an engine out service ($$$). I'm assuming the B46 is just a variant of the B48, but does anyone know if it also has that critical Achilles heel?
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05-13-2017, 07:15 PM | #2 |
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Yes, it does. The B46 is a super-ultra low emission vehicle (SULEV) version of the B48. It has some differences to meet stricter emissions standards in states like California. The layout and engineering is the same, so the VANOS and timing chain is in the back. There's no reported problem with VANOS or the timing chain in these engines thus far, btw. It's more that the N20 and N47 engines have had timing chain issues, and VANOS issues have come up over the years on many engines. Both should not be an issue if you are leasing. If you are buying, it depends on whether you have a warranty and your appetite for risk.
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05-13-2017, 09:37 PM | #3 | |
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With the price as high as it is on a BMW versus other brands we know that last, I expect maintenance to be a bit more, ride a bit better, and reliability to be the same or better. If not, I'll get rid of the Bimmer and bad mouth them to hell to never purchase or lease one. There are too many other brands that deliver cars that meet/beat expectations.
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05-14-2017, 02:55 PM | #5 | |
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The most frustrating thing for me is that from a product standpoint (forgetting current or future reliability) BMW is the only one who is offering a practical RWD offering with a manual transmission. As the poster above said, I'm not expecting Honda Civic like affordability or reliability, but having a massive Achilles heel designed into the motor from the start just seems like poor foresight from the engineers. |
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05-14-2017, 07:09 PM | #6 | |
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I've got an M240i on order, and I plan on keeping it well past 100,000 miles. |
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05-16-2017, 11:03 AM | #7 | |
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To new buyers: you should not be basing your buying decision on anecdotal evidence, or evidence about the reliability of engines that were made to different standards, with different parts, in a different business environment, over a decade ago. Definitely do not base your decision on anecdotal evidence about such engines. That said, maintaining your engine well is absolutely critical, and you should only use high quality oil, change oil regularly, and stay on top of all required services like this guy did - your odds go way up. |
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05-21-2017, 09:44 AM | #8 | |
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On a side note... I'm waiting to see what Toyota recommends for the B engines in the new Supra and Corolla, when they're released. Based on what I've read, Toyota and the other Asian manufacturers are more reliability driven.. I read this in an article about how all the manufacturers are now testing in Nürburgring and why they were testing there.... It would be really interesting if Toyota recommends an API rated oil with the same or different OCI than BMW on the same engine.
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05-04-2020, 09:21 PM | #9 | |
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