Here is my oil sample just got back. The Cherokee hardly gets driven so it sits lot. I'm using Rotella T5 10w30 although this time had to top off with some T6 15w40 (about 1/2 quart if that much...yes its a Jeep so it leaks some). Sample was taken at a 3k interval as I'm trying to get a baseline of the condition of it and how often I need to change. The Jeep was bout used with 113k miles on it and I don't know the condition of the motor or how it was kept up. One thing I was worried about was coolant in oil as it has the 0331 heads but have not been seeing any coolant lose now since replaced the water pump.
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