I have a RE-0880 with the foam sleve and after running my RAM up and down a 3mile dusty road all summer (6500 miles on oil), I sent my oil into Blackstone for anaylsis. Here is what they said:
"The oil, Shell's Rotella T 15W/40, was not contaminated with anything harmful. Air and oil filtration are normal. This oil could have been run longer. "
So if any of you don't trust a K&N, here is more proof to change that paper thing and pump some air to that cummins.

"The oil, Shell's Rotella T 15W/40, was not contaminated with anything harmful. Air and oil filtration are normal. This oil could have been run longer. "
So if any of you don't trust a K&N, here is more proof to change that paper thing and pump some air to that cummins.
