i run synthetic i change the filter at around 3000km then run another2-3000 on the new filter then do a change,i hate castrol,syntec is all i used 2 use until i found out its not real synthetic but they change themolecular structure of regular oil. they take a couple things out and call it synthetic,then charge the same price as real synthetic.use synthetic oil and a good filter

97 gsxr lotsa good stuff 4 sale
95 talon tsi awd turbo loaded sold
95 se 2.5 mtx loaded (fragile handle with care)2 motors 3 trannies
custom y with hi flo cat,custom dynomax exhaust,upper cat mod
superchip,udp,bat\kkm,proflow maf,ford 9mm wires,svt throttle body,svt intake manifold ,custom kevlar clutch,16 pd. flywheel,svt motor mounts ,svt gauges,eibachs\h&r,omp strut brace,dark chrome 16" rials with 225/50 dunlops,cwazy amounts of audio