If you work on them like how I do you’ll know that bmw aren’t reliable . Till you work on them you can say so but don’t spread the rumor saying their reliable . The b58 blows up because the oil pump is plastic . Their m cars all have rod bearing issue . Don’t think just because they made the Supra engine means that their reliable .

 

The oil pump failure is a largely overblown issue that only affects a small # of engines produced in 2018 and 2019 as I recall. There is a reason that BMW has been climbing up the reliability rankings, and the B48 and B58 are a large part of that success.

It would also be easier to take you seriously on this if you didn't type like a teenager.

 

I need to drive one of these.

I haven't driven a good BMW in wayyyyyy too long.

 

I dropped the Supra off at the PPF shop today 26 miles away. I averaged 33.1mpg. That includes idling while fueling and 75-79mph on highway.

 

This post is pure BS

Show me a B58 or any inline 6 motor that wasn’t tuned that blew up.

The rod bearing was on the E9x M3s with S65 V8 motor and is completely blown out of proportion. Also easy maintenance fix by any respectable BMW shop! 😀

 

I've heard this myth get repeated ad nauseum on Reddit without a single source to back it up. The Supra is an entirely BMW product right down to the infotainment. I think it's pretty disingenuous to BMW's efforts and decades of refinement to claim that their engine is reliable because of Toyota, who themselves can't even build a reliable turbo V6 in their trucks.

 

Low compression means comparatively low power (and therefore efficiency) off-boost, and of course more fuel is needed when the snails are active. And the manual at least is geared pretty deeply, so even highway doesn't help. It spins ~3100rpm at 80mph. Auto cars could probably fetch high 20s in casual highway cruising.

I've been working on mine for 25 years, so I guess I'll bite. The S65 V8 and S85 V10 (same engine, different cylinder count) 100% had rod bearing issues, which were largely avoidable by running the correct oil and letting it come up to temperature before ripping on it, and entirely preventable by installing higher-clearance bearings. The S55 does not have rod bearing issues, nor does the S58. A pair of 1000hp S58s were torn down after being used for 2 years in the Red Bull drift cars (so not an easy life by any means), and most of the rod bearings still had the silkscreened part numbers completely legible on the bearings' wear surfaces.

SOME 2019s with the first run of the the B58C had plastic oil pumps. None of the 2015-2018s do, nor do any of the 2020+.

 

I literally started the post you quoted with "It's an evolutionary thing. They've been doing NA straight sixes since the dawn of time.", before moving on to talk specifically about the refinement of their turbo motors over the generations. But since I'm being accused of being disingenuous, here's one source, based on discussions with Tetsua Tada: http://speed.academy/the-2020-gr-sup...n-you-think/2/ I didn't mean to suggest that Toyota had a major hand in designing the B58. I don't think we'll ever know any details of what specific changes Toyota asked for. But it's highly unlikely that there were absolutely no changes suggested by Toyota as a result of such extensive testing, and it's also unlikely that BMW would have refused every one.

 

I have seen a source saying this but I don't trust it nor a single thing Toyota has to say about the Supra's development. I recall reading an article where they said the engineers haven't talked to BMW since 2014 and developed the Supra without any help from BMW lmao.

That being said, the MY20 Supra had a Supra-specific B58 code, while MY21 and up switched to the same B58-code as the M40i BMWs.

 

Oh yeah, my bad. I forgot you have the stick version

 

Yeah the difference in turbos and compression make the B58 and S58 essentially completely different engines in behavior.

 

That for sure is not stellar but you do have a unique high performance car. You need to compare to a similar car. I was referring to LCI X5 40i. It's about 1,000lbs heavier than your sedan. It can get somewhere in high 20 to low 30 for mixed driving. For an SUV this heavy and can get to 60 in 5s, I think that's stellar. I don't think Lexus has any SUV that comes close to this. For instance... the latest GX's 3.4L turbo gets around 17 combined and takes 6.5s to get to 60.

 

I read that article before, but this is al they say about Toyota's involvement with the B58:Nothing here suggest that Toyota made any changes or modifications or suggestion to BMW about the engine, only that they tested it to meet their standards (like the rest of the car). The one line about the closed deck and design and mechanical water pump doesn't imply those being Toyota's suggestions/changes either.
I've seen a lot of Reddit users claim they know an insider who can confirm that Toyota had hand in developing the B58, usually as reliable of an anecdote as anything else on the internet lol. But it's interesting to hear about the engine code, I recall earlier versions of the B58 in the Supra had less HP.

 

Toyota can't make a turbo engine. Why would anyone think they had something to teach BMW when the latter has been at it for over a decade?

 

I think so many people were disappointed with the Supra being developed by BMW instead of 100% Toyota that they were coping by pretending that the B58 was Toyota's successor to the 2JZ and didn't want the stigma of BMW being attached to it. At least, that was my impression from Reddit users lol