To me Valvolicne MC oil was the worst. Not only clunky but engine became very noisy.
MC oil Mobil 1 10-40 was good, 20-50 made mine clunk get louder and engine became noisier as well. In mine Castrol Evo 10-40 worked pretty good but now running Rotella 15-40 and the bike is running very smooth.
Gitty Up & Go!
2007 VN 900 Custom modifications:
Corbin Young Guns Saddle*OEM Classic Gel Flame Saddle (when 2up)*OEM Light Bar*National Cycles Shield*OEM Ribbed Handlebar Grips*OEM Classic Rear Fender*PC III*V&H SCS Pipes (Modified)*Comet Milled BAK*Engine Guard*Genmar Risers*Clear Alternatives Integrated Tail Light*Kury Magnum Plus Mirrors*Kury Cruise Control*Upgraded Horn*Metzler 90/90/21*Avon Venom 200/70/15*Both SW Pulleys.