Thor Forums

[Chuck and Mary Ann]

When I was towing with a gas engine, it was every 5k miles and I drove enough that the calendar was never an issue. When I moved to a diesel at 13 quarts, I went to 7k miles - still drove enough that the calendar didn't matter. Now with the MC and Cummings engine at 17 quarts, we will stick to the 7k miles or yearly, as we don't know how many miles we will do every year. As a do it yourselfer, I save the biggest jugs to put oil in so I can recycle.