I have just finished my rinse phase of the Auto-Rx in my sister's fubar'd durango and that stuff really cleaned it nicely. If I get a chance, I will post some pics of the aftermath. Auto Rx really did a good job!!!! Anyhoo, since she has a short commute to work and the manual recommends 5w30, I was thinking about Mobil 1 0W-30. It has a great add pack and the used oil analysis looks great, any suggestions?