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I would have dealer and maybe a different dealer than you have complained to run a oil consumption test so you will have documentation to run further up the chain.This has been occurring since it was new. Now has 22000 miles on the OD. Have been using 0W20 Mobile One since first oil change.
My worry about this stems from the problems that several other 6.2 owners are having here around main and rod bearing failures. Worn or damaged main bearings throw off an excessive amount of oil which flows along the crankshaft and is thrown up into the cylinders.My '22 Denali 6.2 is using a quart of oil every 2000 miles. GM says this is within specs. Have to check oil often as not sure if it will get worse. Any suggestions.
Why does GM say that this rate of consumption only applies to vehicles under warranty? Are they implying that that the consumption increases when you hit 36K?As much as I hate to say it, unless you are consuming more than 1qt every 2K miles, GM is going to call it normal..and no dealer is going to be able to change GM's mind...below is an excerpt from a bulletin on Oil Consumption, see here for full details.
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