I ordered a 2002 3500 QC 4x4 with the regular motor and 5 speed transmission. My question has to do with engine oil and filters. I got 10 free oil changes from my dealer. I have them done every 5,000 miles since I figure I am between severe (3500 mile change) and easy (7500 mile change) driving. The dealer uses the Mopar filter and Mopar 15w-40 diesel oil. Has anyone ever used this filter and oil? I've read a lot of the oil discussions and articles on the web site and in the magazine. I'm just wondering if anyone might have an idea of how the Mopar stuff stacks up against the other oils and filters. The truck has 23,000 miles on it and is running great and never uses any oil. I work it pretty good during the summer pulling my boat down the highways in the Oklahoma heat, and it never misses a beat. Just wondering what others think.