I don't have the manual for my 2008 cross country so I need to ask this question. 340 HP Cummins. Freight liner custom chassis. Took to Gafney May 2015 had full service. How often are you supposed to...
I try to change mine about twice a year even though there is not a lot of mileage. I put new oil and filter in before my usual longer trip ( about 5 K miles ). I then try to get it changed again for the next months even though much fewer miles. I consider this cheap insurance to keep the old 5.9 cummins going strong. Changing oil on the motorhome is way easier than my cars as there is so much room under the engine to work. Just need a much larger pan for the oil. Cheers Doug