So when I go to a GM dealer what am I asking for -- Eaton m90 supercharger oil from a pontiac could you give me a model or year?(If the GM parts counter personalites are anything like the one at my local toyota stealer it should be fun). I have over 40k on my supercharger and it sounds fine. I thought it was best to change out the nose gears at 60k to the tune of 5 bills. I would much rather change the oil and maybe get a few more miles before doing the nose drive. How much does the 4oz's cost? Thanks Chad