The motorhome I just bought has a Genrac Q-55G generator with the Generac GN480 engine (only 67 hours on it). It's a 2 cylinder V engine on it's side and I think is about 15 hp. Anyway, the air filter assembly takes a paper element and an oil wetted foam element. I looked at it and the foam is dry, but the paper element has stains from oil wetting. Seems odd to have both sandwiched together in contact. Anybody have experience with this setup? How do you oil the foam? I guess you would wring it out very well. How do you clean the foam? Can I hose it from the back side with CRC Electronic Contact Cleaner (which leaves no residue)?