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This is something that's been covered a million times....

The GM oil life system (OLS) uses a computer algorithm to determine when the oil has reached the end of its service life. There's no oil condition sensor or anything like that. The light has to be manually reset by pushing a button ('94) or as fbi9ci stated.

Also, the OLS on these cars is set up to assume conventional oil. If you're running full synthetic, its not even valid. Also, there have been documented cases of the OLS screwing up in our cars, and either coming on too frequently or not at all.

Given all of that, I've played with it, but I dont trust it. I keep a written maintenance log and change my oil based on mileage.
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