So I bought my 2008 Chrysler 300 Limited AWD with the 3.5L a few months ago. So far I have put about 5K on it and have changed the oil once. The oil I used was Mobile 1 Full Synthetic 10W-30. But now the circumstances are a bit different. I am an aggressive driver and now have applied the Diablo Sport Trinity Tune (preloaded) to the mix. At the current moment she has 36K on the ticker. Any suggestions on what oil I should be using? She is already requesting yet another oil change. Thanks in advance.