times 3000My son is a GMC tech and told me about this yesterday. Wow. Thickie power level 11 unlocked/infinity win thick/thin argument
GM now saying to use 0w40 in 21-24 6.2L
- Thread starter That John dude
- Start date
Will go down in BITOG lore...
Both Kia and Hyundai are now recommending oils as thick as 20W-50 in many of their engines, that were originally stickered for all the water thin stuff. They've had to replace millions of dollars in engines because of it.
https://www.google.com/search?q=Kia...j33i299l3.32403j0j15&sourceid=chrome&ie=UTF-8
your "infinity win" portion was hilarious.
cant be a whole lot of difference in 6.2 and 5.3 design/parts/ etc........towards the reason why they have made this change to a thicker oil.
i would use at least a 5w30, in my uneducated opinion
Yep, the best thing imo I ever did was dump the FF 5W20 in both my Jeeps and replaced it with XW30. One was done in about 500 miles, the other as soon as I got home from the dealer. Time to hide, and with my flame suit on.
Ok, assuming this is all true, and all these are in facts Dexos R......why even consider Supercar? Mobil site for FS says nothing about Dexos R.....I call BS.
I say the reason for the inclusion of FS is the price. Many truck owners would flip out if their oil was ultra expensive.
Easier to just order Amsoil SS for diy
I finally switched my Jeep Grand Cherokee out from 5W-20 to 5W-40. I never said anything to my wife about it. And when she went to Walmart the other day, she said it really seemed to be a lot quieter.Yep, the best thing imo I ever did was dump the FF 5W20 in both my Jeeps and replaced it with XW30. One was done in about 500 miles, the other as soon as I got home from the dealer. Time to hide, and with my flame suit on.
You better be careful mentioning "quieter" from swapping oil or changing grades, that could be problematic here....... lol
dnewton3
Staff member
It will be interesting to see if the 40 grade ends up being a real solution to the problem(s), or just a band aid. Time will tell.
I do have a question (serious, not a JK) ...
As the notification from GM covers 2021 to 2024 vehicles, it's conceivable that some 2024s may be "new" on the lot. Not many, but a few.
Since GM certified these vehicles to the EPA using 0w-20, would this be a violation of the certification to use 0w-40 because it's not been "tested" for the EPA fuel mileage statement on the window sticker? And does that same topic of fuel mileage certification invalidate it backwards to the other model years? Does GM lose credit for those MPG applications in all those vehicles?
Simply put ... In the knee-jerk reaction to "solve" (mask?) this engine problem, I wonder if they have now created a legal issue for themselves?
I do have a question (serious, not a JK) ...
As the notification from GM covers 2021 to 2024 vehicles, it's conceivable that some 2024s may be "new" on the lot. Not many, but a few.
Since GM certified these vehicles to the EPA using 0w-20, would this be a violation of the certification to use 0w-40 because it's not been "tested" for the EPA fuel mileage statement on the window sticker? And does that same topic of fuel mileage certification invalidate it backwards to the other model years? Does GM lose credit for those MPG applications in all those vehicles?
Simply put ... In the knee-jerk reaction to "solve" (mask?) this engine problem, I wonder if they have now created a legal issue for themselves?
I think the reason GM feels safe to say 0w-40 is because the new EPA admin wants to roll everything back and GM knows no one will be coming after them from the EPA
wemay
Site Donor 2023
Although I find it suspect that viscosity can fix design flaws, if there's a way to make a significant difference in wear, this it. Going to 5W-30 would not have been.
this a a great point, maybe the best point of the day.....this question asks a lot.
That could be a valid point, and as a result we might get longer lasting better engines as a result.
The answer is yes from a CAFE standpoint, the CAFE score only applies to the vehicle as tested - so if its now back-spec'd with thicker oil, that would be a no no.
As mentioned however, with the new sheriff no one probably cares, and with GM, they likely would get a pass even in the past.
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I run 5W-30 in my Toyota, but it spec's 0W-16 and has 13:1 compression, and there are many out there with 200K miles, no issue, no oil burn.
The hybrid / Atkinson cycle version of the Toyota Dynamic force runs 14:1. There is a user on this board with it in a mini van with 200K miles and it, always running 0W-16, and no issues.
So I am all for running thicker oil, but to think that the "thin oil" hurt this engine in this case is nonsense.
The hybrid / Atkinson cycle version of the Toyota Dynamic force runs 14:1. There is a user on this board with it in a mini van with 200K miles and it, always running 0W-16, and no issues.
So I am all for running thicker oil, but to think that the "thin oil" hurt this engine in this case is nonsense.
just bought a new 5.3 tahoe. i would love to see GM approve M1 0w-40 for the L84 engines, i am hesitant to deviate from the manual while under warranty.
Yeah that’s the problem, unless GM declares it’s safe to run they will use it as an excuse to not cover engine warranty issues when they ask to see oil change history. If it says 0W-40 then they can screw you.
I used to think that way as well. But by switching to a heavier viscosity, you are lessening the chance to actually have to use the warranty. And besides, if the engine started smoking, or making funny noises, you could simply switch the oil out to whatever they had "recommended", before you take it in.
And if they want to see receipts for oil changes?
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