[deserth3]

For the compas cal. Make sure the connector is tight in the back of the mirror. The manual says go in circles doing less than 5mph. The manual doesn't specify how many circles. My old Blazer used to do it within 3 circles. If you've done that then I'd say it's time to take it to the dealer. There's a problem.

If you don't have onstar there's no way to check the oil life that I know of. Kind of ignorant if you ask me. But I'm no expert and someone may have figured out a way.
I have onstar and they send me a report via. email once a month with a full vehicle diagnostic. Oil life is included.