I just took the onan number along with old filter for sight comparison and the NAPA guy got me a Napa Gold filter no. for my 6000w easily and twice as cheap !!!
There are several places you can find a cross reference guide for Onan oil filters. Most auto parts stores will have reference guides. Many department stores like Walmart, Sears or Target will also have them.
What is the fram oil filter cross reference for onan oil filter 1220893
1492341
Napa FIL 7398
Fram PH3614
Most cross to a Fram PH 7575
That would be a Fram CA8235
That would be a WIX 42362
i found it on ngk #2238
Fram CA140
NGK - BPR4EY AUTOLITE - 65
Onan - P/N 167-0272 Champion - P/N RS17YX Autolite - P/N 106