Quote:
Originally Posted by ember1205
The direct statement in the owner's manual is that dexos1 Gen2 5W-30 is acceptable for street use in this motor. If the oil used meets that standard, there is no voiding of the warranty.
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He used Valvoline 0w-40. They don't have any 0w-40 that meets spec. I'm sure his motor will be fine, but he basically just voided the warranty on his motor if GM asks for maintenance records.