Read this:
http://www.gm.com/corporate/responsi...nce_040104.jsp
And go by the DIC oil life, it will save you a bunch of money and headaches. I have been going by GM oil life monitors for many years and never had a problem. I own 6 GM cars with the oil life monitors on them and my vehicles have anywhere from 9,000 miles to 186,000 miles on them.

 

Thanks for sharing the site and your comments! I really appreciated them!