Answering Your Questions about the Gen 3 B58 (Follow-Up Video)

More Details on the B58TU2 Engine: • B58 Gen 3 Updates
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[@kern417]

More Details on the B58TU2 Engine: kzbin.info/aero/PLjhDMmioxsctgYV1OPwH9N1zRzQY_lEw0&si=A2YJAOH0n6HAE76u

[@Syncopia]

The last video went viral because it confirms what we've all been feeling. Engines are no longer getting better, they're getting worse to meet impossible emission goals.

[@universalg_]

Yes

[@garyderian4350]

Agreed. As I see it, fuel economy features on newer engines often cost more in the long run. A little fuel is saved, but repair costs skyrocket at higher mileage, say 120-150k.

[@kenphilpot1903]

That’s how tech always goes.. carbs, cats, direct injection, hybrids, and oil. It always gets better and increases performance. Most people don’t care about performance.

[@Misfittwinz]

Real

[@Respect_N55]

“We can even read books” 😂😂😂😂🤞🤞❤️

[@DearSX]

Hate to say it, buts some stigmas or other untruths still around for black people, can only imagine what's it's like for young black persons growing up. My little cousin was shocked when I got her a black children's book. She had not seen one before.

[@BraydenPerumal]

You very well versed in the B58 platform sir, I enjoy your content

[@mosestaukobong5937]

Bro your channel is so insightful to be able to grow as a person we learn something new everyday I jus hate idiots who are negative or say stupid shit. Keep up the great work.

[@YoungBurr94]

1:36 has me crying 😭

[@GuhbsBeats]

Dude, I own a manual 340 and you have been such a blessing for me in the past year. Thank you.

[@Tachyon836]

Gen 1 at 93k miles and kicking strong Sticking with this

[@CrimsonRequiem1]

same im at 92k rn

[@Tachyon836]

@@CrimsonRequiem1 just did my injectors, brake fluid, and brakes, cars going strong minus a strut with a lil leak

[@CrimsonRequiem1]

@@Tachyon836 I gotta do the 100k mile maintenance and replace my brakes since they’re super low rn but throughout the car’s life it’s had no issues

[@PatrickAsplund-y1j]

Tremendous thank you on B58 Gen 3 issues. You saved me from potentially buying a huge expensive headache. I’ve been seriously considering an 2025 X3 M50 or 2025 X5 M50e. I will probably try to out the purchase off 1+ years.

[@gogz1981]

another banger by kern.. always dropping knowledge 👍🏼

[@luisoliveras9583]

Intros are always hilarious 😂😂😂

[@supremegt]

Real live walking and driving B58 encyclopedia. Thank you for your work bro. BMW=black man working

[@pleaseletitgo1818]

That 1st question was made in a tasteless manner.

[@mbradea]

Man @kern417 so sorry you have to deal with such garbage questions as that Way to answer it so humbly and completely like a gentleman. Respect.

[@malikharris8297]

I love this channel I feel like it helps my knowledge of how bmw engines work. I drive an 2013 328i xdrive and have some mods N20 engine. I would love to some day hear a video with your depth about the N20

[@TheWeavingBagel]

Thanks for responding!

[@DearSX]

M54 and M50 had issues even 30 years ago, but they seem simple now compared to modern engines. Cheap parts cause some of the old issues, like plastic hoses and water pumps.

[@LoopBooost]

ima wait for gen 4 b58

[@ranmas2004]

Probably be worse....

[@latinconn]

It's sad that here we are in 2024, and the question is not so much whether or not, Mr. Kern Jr. knows about B58s, but rather, @Trichau1563 shows his ignorance by adding "black guy" to the question... Ignorant... no other way to describe him/her... SMDH...

[@sharklos]

Came across your channel while trying to diagnose the root of a coolant leak in my 2018 M240ix. Stuck around for the vast wealth of knowledge you share about the platform. Beats scrolling through all of the forums online 😂 sadly the M240 got totaled in an accident 2 months ago and it's been hard deciding what daily to buy with the insurance money. I really like the newer m340ix but worry about reliability. Any suggestions/insight would be greatly appreciated 🙏🏽 looking in the $50k-$60k range w AWD preferably for snow where I live. Thank you, Kern!

[@lilo.60d]

So the 2025 M340 might come out with this issue or you think they might address it before production date?

[@garyderian4350]

When the exhaust valves are closed, the Valvetronic keeps the intake valve closes. So the air in the cylinders acts like springs and little energy is lost. If the engine is pumping air energy is consumed.

[@kern417]

not sure about that one. even at minimum valve lift the cam should still be actuating the valves.

[@garyderian4350]

@@kern417 If the intake valves opened even a little, and the exhaust were disabled, the air would pump back into the intake. This would consume energy and defeat the purpose of disabling the exhaust valves. By logic, BMW would have tweaked the Valvetronic to keep the intake valves closed.

[@sonerozgur]

When fuel and ignition is turned off the pistons are still moving air and it consumes energy. Blowing air from intake thru exhaust costs kinetic energy. Taking away heat from engine block is also energy loss. Closing the valves cuts this energy loss. Not sure how this helps with mechanical friction. Maybe frictional forces on cam are also reduced because of smaller spring force.

[@garyderian4350]

@@sonerozgur Right. Pumping air takes energy. A cylinder with a cracked open valve will see pressure on the upstroke, which leaks out, then vacuum on the down stroke. Keeping both valves means the compressed air pushes the piston back down. Friction is unchanged, but this is better than consuming both friction and pumping air.

[@M4csdtn]

@kern417 thank you for your knowledge. I have a f82 m4cs I drive on the weekends and I ended up getting a new m340i as a daily. Had it for 6 weeks with nothing but engine issues. My wife's A90 supra has been bulletproof so was really bummed out about this. Now looking to buy and older model m340i

[@NiggaWigga-kg7nf]

What type of issues? My 2020 has been bulletproof

[@M4csdtn]

@@NiggaWigga-kg7nf check engine light, not starting, rough idle, going into limp mode. This was on a 2025 model. This is only affecting Gen 3 b58 with the cylinder deactivation to save fuel from bmw. You have Gen 2. You should be fine. My wife supra has Gen 2 as well no issues

[@roberthatley7415]

Look ma a made it into one of Kerns videos!!!! Yeah this gen 3 b58 “cylinder deactivation” is definitely different from the traditional variable lift lifter technology that GM used or still uses idk. Regardless whatever this alien technology cylinder deactivation is I’m not here for it if it causes increased unreliability and complexity. It’s cheaper and more environmentally friendly (if that’s ur thing) to spend a lil more on gas than to replace heads/engines. I was talking about this new gen 3 b58 and its issue with some of the 30 plus year techs at my work today (I work at Toyota as a beginner technician and my own b58s/bmws on the side) and we were all so confused as to why bmw would do this and couldn’t figure out how this new system works either lol. Gotta hand it to Toyota for never dipping their hand in this pot even thought they do make mostly boring cars, with several exceptions ofc.

[@AMS611]

AYO I pray sir kern knows that guy personally or something cause wow

[@spoiler9112]

Help me understand ... If BMW is aware of the issue on this new B58 version, and there is a TSB and the problem will be corrected, what is the issue here?? Is it because it's soon after release, or because it is unusual for other reasons?

[@JeffmanRSA]

Thanks for the video. Great content 💯😅. Saw my comment on the 2024 m340i lci. 😂

[@mbradea]

Can you pleaaaase please do a video on the new B48 mild hybrids? Thea IMO are the biggest news for BMW but man are they ever keeping the details under wraps. No fuel economy measures posted anywhere (US, UK, Canada sites), they list identical HP and TRQ measures - which tells me they are explicitly making sure they only pump electric power under the max hp/torque curves. Would be great to dig into the actual power delivery of these engines, do they shut off under coasting at ANY speed (like dropping into neutral on the ZF 8SP), how do you instruct the engine to “eat speed”/regenerate break now that the shifters are all gone? With the prior engines putting the gear level left would downshift aggressively so that you would engine brake, same thing on the i3 except it would bump up the regen breaking so that you can do that dynamically at every stop you make. How do you now do this dynamically (ie: not a drive mode) without a shifter?? 😫

[@AMS611]

Not that anyone’s racial ancestry should have any bearing on the topic, but (arguably) the two most widely-recognized “spokespeople” of b58 motors are black from the islands. Why I half think it’s trolling

[@Sazonman]

I was just about to purchase a new bmw x7 gen 3, Now that i know about the issues, I'll pass and wait for gen 4

[@BanBMO]

So a 2021-2023 BMW M440I has the Gen 2 B58 and therefore doesn't have these issues?

[@jieddo1]

Dang Kevin you really shook the flea's off with this one. Theres a bunch of em in the comments feeling some type of way about addressing the closet racists down in the comments XD.

[@AgentExhale]

does the reintroduction of the diverter valve affect the burger motorsports BOV chargepipe mod?

[@luk2480]

Damn, should I have gone with S68 then?

[@Trenchluv]

The 7 series and x7 have been using a mild hybrid since 2021 on their b58 versions. Are those also considered gen 3? What engines are found in the 21 and 22 MY x7 ? It sems all of them are mild hybrid? Are these a gen 2 B58 with just a generator instead of alternator?

[@nallis01]

What Gen B58 is in my wife's 2021 X5 g05? Forums are no decent help. Confused.

[@DrivesAlot]

I believe it’s a Gen 2

[@nallis01]

@@DrivesAlot that's what I believe that I am reading on the forums too. Thank you

[@stea2494]

I’m reading that my 2022 x5 has gen 3???

[@CSKeaton.]

Will the 2025 m240 have it??

[@Cardboardcar918]

Please make a video about the s68 on reliability, I want to get one but contemplating

[@LBB988]

Any idea if the gen3 in the m240i 2025 model?

[@cupompa]

You make great content. I reported that guy.

[@lilyanimate7266]

its kinda to bad to see them take this extra step and complicate the motor even more and maybe they have gone to far. the question is what generation b58 would you choose if you had the choice in a new bmw. All i know is my little m240ix is hands down the best car i have ever owned, its easy to drive and can be alot of fun to.

[@kern417]

@@lilyanimate7266 I'm a fan of the 6 port TU. Seems to have the most capability out of the box. Just a lot more expensive to get going if you get a late model car.

[@garyderian4350]

On the oil issue, my 2025 X5 manual says to use either BMW LL01 FE or LL22 FE++. LL01 FE can be had up to 0W-30. The LL22 FE++ is the super thin stuff. Since the TU2 engine has port injection, low speed pre ignition is not an issue, so it does not require an SP oil. SL, SM, and SN oils are good.

[@chrisbradley3224]

Whether or not it can have LSPI depends on a lot of factors and I don’t think you can generalize because you don’t exactly know how the DME is functioning and engine is designed in general. You won’t find an old API spec on a new BMW spec oil anyway.

[@garyderian4350]

@@chrisbradley3224 The owner's manual specifies SL, SM, or SN. It does not specify SN+ or SP which are the low calcium oils intended to combat LSPI. The chance of LSPI is greatly reduced with port injection. Having both port and direct is the best of all worlds, except for the cost and complexity.

[@chrisbradley3224]

@@garyderian4350 you’re using SP packages anyway. All recent LL01FE, 17FE, and 22FE are going to have low calcium and half magnesium additive packages. Try doing some actual research.

[@garyderian4350]

@@chrisbradley3224 🙄 You don't have to be a jerk about it. My point is the TU2 has a low chance of LSPI if a higher calcium oil is used. Older oils have better wear properties. The first and second gen B58s should use SP oil.

[@chrisbradley3224]

@@garyderian4350 older oils do not “have better wear properties”. I’ll stop being a jerk when you stop spreading misinformation.

[@MrWowzors]

Please follow up if a fix has been found by BMW!

[@Gothenburgpiano]

what about X5 50e ?

[@dogchainsaw3923]

do a video on the audi AAN

[@SomethingSomething1337]

hell yeah buddy!

[@Sneeder88]

Are you good at Smash Bros???

[@akazi1582]

"What does a black guy know" 💀💀💀💀????

[@benx011]

I thought it was in the 2023+ m340i

[@eysmanobando9863]

😎

[@PK_M340i_Fire]

1:15 yup settles it all. You are just like the rest of us. BroScience to say it nicely. You are equal to everyone else broski. Your thoughts and opinions are just that....opinions. When you went off the hinges about me replacing my charge pipe on the B58tu with an alum option you said it was unnecessary. It is 100% needed when adding boost and modding. You cannot convince me plastic is more durable than aluminum. This is my 3rd BMW. I have gone down the hard path N54 E90 335i N55 F30 335i and now B58Tu M340i I also have the XP to toss my opinion around the ring as well.

[@kern417]

and you still haven't replaced that flimsy silicone coupler with a steel one smh. amateur.

[@geargrinder69]

Saltier than the Red Sea 🌊

[@zephyr.r]

nobody ordered a yappucino 😂

[@larrygraham1224]

Why would you even dignify the first question with a response? Stupidity is self validating.

[@mgm6708]

Man, I love your content. You've been a go to for me in modding my car. I just wish you didn't bring race/ colour in to it at the start of this one

[@kern417]

@@mgm6708 i brought race into it? 😂 It's alright, you guys don't see the comments i get all the time. But if they want to know who I am, i can explain 😎

[@AMS611]

@mgm6708 L comment

[@zoe7657]

Agree, till he brought it up I did not see in any of the comments. Must have been a one off comment. Cause it was not trending till he brought it up.

[@kern417]

what's crazy is i have been doing this for years, and you guys are triggered by 1 comment i see regularly. the first time was back when I wasn't even in front of the camera, someone just saw my hand and acted like it was a jump scare lmao. if this bothers you that much, you definitely don't want to scroll on some of my other videos, much less see the ones that youtube auto-rejects. clearly i wasn't bothered by it. you shouldn't be either.

[@zoe7657]

@kern417 lol... I didn't even give it a thought to you brought it up lol. You said something about a video in the past? The future is the path forward. I look forward to good content. Hopefully even some news that the recalls will set a path with no drama regarding the Gen 3. I want to purchase an x3 m50 or 2025 X5 that will last! 🤞

[@dimmacommunication]

What's the point of talking about race ? every time uff... it's annoying.