My C-9 runs great, the only problem is my oil pressure is to high on a cold start (125lbs) so I plug it in for hour and if the weather is cold out 2 hours. Next oil change may go from 15w40 to 5w40. By plugging it in I get the pressure under 100lbs, this is from my Silverleaf.
I change my oil at 5k or one a year because of the HUIE pump and fuel filters at 10k and use only Advanced Efficiency filters and send my oil samples into Peterson Cat.
2006 Country Coach Inspire 360 40ft Genoa Designer Series, Samsung 197 RR
Cat C9--STEEL & COPPER Bolt Together Radiator w/ updated rubber mountings
SilverLeaf 330 Magnum 2812 PSW 2011 Ford Edge Sport-Air Force One