GM now saying to use 0w40 in 21-24 6.2L
- Thread starter That John dude
- Start date
The L86/LT1 didn't have any lower end issues, This is a embarrassing moment for GM!......First thing they needed to do is extend the warranty on ALL L87 engines!
I see no reason not to beyond price. Is is expensive around $10 per quart. Formula wise it is alleged to be the same as the old Mobil 1 ESP 0W-40 that was always touted for the Corvette.
I'm surprised they haven't done that first thing. They know there's issues with some engines so warranty extension is mandatory at this point.
Supercar isn't the only DexosR option: https://www.gmdexos.com/brands/dexosr/index.html
Are you saying GM is spending $10zillion dollars on recalls, oil changes, oil caps, and it's NOT going to help. !!!
Maybe. Probably not infant mortality. But good for long term ownership/engine life.
Amsoil recommends: https://www.amsoil.com/p/amsoil-signature-series-0w-40-100-synthetic-motor-oil-azf/?zo=515729
It should help get people past the warranty period....
Someone mentioned programming the variable pressure oil pump for the thicker oil.
It sounded like a joke, but it might be something to consider. As long as the oil galleries are full, plain bearings, especially in the connecting rods with their elliptical rotation will self pump and take all the oil they need. I increased oil pressure won’t necessarily pump more oil through the rod and main bearings.
Not so much the valve train and engine cooling where increased oil pressure should help keep everything pumped up and increase flow.
Viscosity improvers in this case are not necessarily a bad thing. They help with oil pressure without the corresponding heat producing and power robbing HTHS.
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Curious why they switched it to 0W-40 for the recommendation. Because the thin 0W-20 CAFE oil is contributing to the problem? Or might it be causing the problem? Crazy EPA regulations are being wiped away at a very past pace right now, and automakers see this, and probably are thinking..thank god we can finally stop caving to the government environmental crazies, and now we can recommend the oil we actually think is best for the engine. It may have taken a recall in this case, but watch how the oil recommendations start changing across many vehicles.
Honda / Acura has a massive recall going currently on their J35 series engines, somewhere around 1 million, and an investigation into more. They say the crankshaft journals were machined out of spec, or something like that. Bearings are getting chewed up and complete failure in many cases. Manufacturing defect I'm hearing more and more now from automakers.
wemay
Site Donor 2023
He goes into what the issue is after reviewing the recall literature.
I have sent an e-mail to the Mobil technical support for some clarification on the FS and ESP X4 being “overnighted” on the DexosR approval list.
I asked:
- Is the FS for sure the FS Euro Car Formula 0W-40?
- When will the product pages on the Mobil site be updates?
- When will the bottles show DexosR approvals?
- Is the FS Euro API SP the same or did it have to change for DexosR?
I’ll post up any answers I get. I’m genuinely curious on this. ESP X4, doesn’t really surprise me, since Supercar is essentially the old ESP (low-er saps). But FS Euro is interesting being NOT low-saps.
I asked:
- Is the FS for sure the FS Euro Car Formula 0W-40?
- When will the product pages on the Mobil site be updates?
- When will the bottles show DexosR approvals?
- Is the FS Euro API SP the same or did it have to change for DexosR?
I’ll post up any answers I get. I’m genuinely curious on this. ESP X4, doesn’t really surprise me, since Supercar is essentially the old ESP (low-er saps). But FS Euro is interesting being NOT low-saps.
What's funny, is cutting a page out of the owner's manual and replacing it with another page that recommends the 0-40!! This way the "trust the engineers" crowd can get their marching orders and feel good. Will they apologize to the ones that said thicker oil is better? Of course not - they never admit they were wrong - they just double and triple down.
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It's NOT "thicker oil is better". It's the crank clearances are too big, completely out of spec. and the heavier oil takes up the slop.
It's very simple math. Heavier oil takes up .001 of bearing slop. It's a solution to the problem.
Doesn't have to be the super car branded one exactly. I've been using whatever off the wally shelf euro 30/40 instead of 0w-20 in my new engines for years and they're still under pt warranty. Use whatever euro 30/40 oil. 40's are a touch thicker. I'm running 5w-40 in my escalade and outlander sport at the moment.
My 2025 Camry calls for 0W-8 in the manual and on the cap. It gets 0W-30. Got 78 mpg yesterday on a 10 mile trip with stops and starts, doing the speed limit. 68 percent EV mode I think it read after the trip. Mostly I get about 65 mpg on that route. Averaging 57mpg from a mix of city and highway driving. I doubt my mileage would be any better with 0-8. Long story longer, I hope for the GM customers the 0-40 does the trick. That's a lot of money to spend and have your engine blow up.
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