Bob I got the filter from Camper's World, it is an Ohan filter. I have not bought the oil yet but will look at the manual and see what they recommend.
I have changed the oil on the 8.1, no big deal. I replaced the filter with the same type that I took off and used Mobil ! in it. I used to be a Mobil Oil dealer so I am sold on the Mobil 1 oil. I run about 8000 mile a year and normally just change the oil once each season.
Darby R. Corwin