I assume you have a Onan 10KW Quiet Diesel generator model 10HDKCA in this model DSDP?
How many hours are on your generator- look at the hour meter on gen set or on Silverleaf screen under Generator if you have it? Oil & oil filter should be changed after first 50 hr. then at 200 hr. interval. It uses an Onan 122-0893 or NAPA 1307 oil filter & holds 5.9 Qt. of 15-40 Diesel engine oil- same oil as your Cummings Diesel engine. Air filter should be inspected & changed every 700 hr. in normal conditions- if you camp in the desert or on beach areas make it 500 hr. Fuel filter should be changed every 500 hr.
On a 2017 model year coach, I doubt you have this many hrs. on the generator unless you boondock a lot. However- you may need the initial 50 hr. oil & oil filter change. Hope this helps?