Just got an 04 CTS with the 3.6. Ayone else notice if there's has a slight tick when idling. Especially cold or do I have a problem. I know GM motors are notorius for ticks. My fiances brothers 02 Camaro(V8) sounds like a diesel. I am at 500 miles and plan on doing my first oil change at 1000 miles. I just want to know if I should make a visit a little sooner. Yes, I know alot of you did your first OCs way after what I plan too, but I have always for the life of me gotten my first OC at 1,000. Then its on to a regular schedule of every 3,000.