I've been wondering the same thing. I'm sure k and n oil will work fine. It will make it red. I'm sure someone sell blue filter oil.
99 Kawasaki Vulcan 800 (sold)
2012 Vegas (traded)
2013 Cross Country Tour
Victory Tri-Ovals, Reverse Kit, Lloydz air filter, Lloydz quarter turn throttle ring, PCV, Lloydz Touring cams, HMD Bars, DGD keyless ignition, Rockford Fosgate Amp, klockworks windshield. 119hp 123lbs torque.