Oil consumption on the new 6.6L V8 ? Owner feedback please.

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Apr 8, 2024 | 4:39 PM

#31

mountainmanjoe

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Quote:

Originally Posted by canknucklehead

I have had my 2022 GMC truck since new,

which truck? which engine?

Apr 8, 2024 | 10:45 PM

#32

pachuconj

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Quote:

Originally Posted by ry4n

I got it from Glen Sain in Kennett, Missouri,

it took me until about 2 weeks ago and countless dealers to find out GM closed the ordering books on these vans until Q4. Until then it was all sorts of “let me get back to you next month!” Or no response at all.

Apr 9, 2024 | 12:22 AM

#33

canknucklehead

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Quote:

Originally Posted by mountainmanjoe

which truck? which engine?

2022 GMC SIERRA 2500 6.6L Gas with 120,000kms on it now.

Apr 9, 2024 | 5:24 PM

#34

mountainmanjoe

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Yup that's the same 'L8T' engine that's in the vans. Iron block. No cylinder deactivation or auto stop/start.
https://en.wikipedia.org/wiki/Genera...ock_engine#L8T
I imagine the constant oil burning must foul up the whole system with carbon deposits, and reduce catalytic converter life. Not to mention jam up the piston rings.

May 22, 2025 | 12:46 PM

#35

Saab95

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Quote:

Originally Posted by KubiJ1AS

just put an order in to a fleet chevy dealer for a 2023 Express with a 6.6L V8.

This engine was introduced by GM io 2020, and I did some research on this engine and it seems that a lot of people are complaining that it burns oil.

I am just trying to find out if owners of this engine see oil burning issues with it in their vans, and how severe.
I am not about to buy a new van so that i can add 1qt of oil every 1000 miles...

What is the reliability of this vehicle if maintenance is kept up to date.

Any feedback highly appreciated.

I have 2024 Chevy 2500 and it absolutely burns oil, just checked it yesterday NO READING ON THE DIPSTICK , 2 quarts low, 35 percent oil change life left , probably would have been 3 quarts low at oil change, this is absolutely insane, truck was doing this with 15,000 miles , now had 25 k , brand new truck, would never buy Chevy again, i didn't buy a brand new truck to have to check oil constantly and be adding oil for the rest of its life