Dude!!!!!Castrol 5w50 Full SyntheticI had a beefed up Cavalier'98 with a super charged 3.1lt V-6No it didn't come from the dealer that way. I'm a mech for the army. I put that oil in the first day I put that engine in and 5 years later, with an oil change at every 5,000km or more never more than 6,5...