Thanks for the Info, I agree with stiking to the 7000 in the manula for Dodge, it also lists towing as one of the conditions for the 7000 change. I also read on the TDR that many Cummins owners use the Aims Oil synthetic, and change it every 10k, with the filter every 5K, and they love it, improved gas milege and performance are also reported. The price of the Amsoil for that schedule is about 100 bucks, same you pay for 2 changes at the normal interval, so I am going to give it a try. The people I have talked to that actually use the Amsoil swear buy it, and it is supposed to be top of the line.
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