I think it's time for our own Crossfire used oil analysis thread. If you've had one done post it up here. My sample is in the mail to Blackstone and when it returns I'll post it up. I've always used Mobil 1 0W-40 and changed at least twice a year which works out to 2,000 miles between changes as an average. Some members use other viscosities. Some use extended oil changes. Chrysler started using Pennzoil 5w-40 quite a few years ago. One member is trying Royal Purple 10w-40 that I know of. Knowing your oil is doing it's job is better than thinking it is. So ask for the test kit (its free) and find out for sure, like me. Let's learn what our engines prefer for ourselves.

Les