From what I heard that's for the old Patrol engines. Our TD42 engine has been using synthetic oil that was maintained by casa. They use a German brand fully synth oil, I just forgot what brand it was. When we pruchased our unit last year, I was filled up with Mobil Full Synth oils, but due to financial constraints, I'm now using Petron All-Terrain.

Btw, it will comsume 10 liters of oil per oil change. And about a liter add inbetween services.