Currently letting the shop do my oil and filter changes but I'm about to start doing my own again....what do you guys recommend...Shell Rotella T6 or AmsOil Premium? I run 15W-40...also what are the best oil/fuel filters I can put on this thing? Ran Wix filter on my old gasser but not sure about diesel. I saw where they make adapters for Caterpillar oil filters but I'm thinking those 2-micron filters might cause too much restriction in oil flow/pressure.