I use Delo 400 SDE 15W-40. It has CK-4 rating, also meeting CJ-4 rating that the 2013 Maxforce 10 requires. We bought our coach used and the previous owner had just changed the oil with Rotella T. My first oil change, about 9000 miles later, was also with Rotella T. We had to do a few regens, but nothing crazy. Started using Delo and even fewer regens. Did have a doser valve issue,( the design of the gasket was faulty, the hole in the gasket was to small. Ever since the valve change, we have not had to do a regen, about 15,000 miles. The engine is quieter with the delo, and it goes on sale at Napa and Advanced a few times a year. Stan
Stan & Mary, Maggie the Canine Princess and Lucy a Princess in Training....
2013 Holiday Rambler 36 pft, 2014 Cadillac SRX toad