Recent content by GKG

Thanks.. What is the external bypass. Is that a secondary filter that filters out smaller contaminants?

I have a class A RV with a Cummings ISL 9, with 24,500 miles and 580 hours. I'm using Mobile Extreme full synthetic. The oil change interval by Cummings is 1000 hrs, 21,000 miles, or 18 months. Since my last oil change, I put on 6500 miles, and about 150 hrs, all extended highway miles. It...