I recently bought a 2003' YZ 450F in pretty good shape and for a really nice price.. The guy I bought it from always ran a synthetic "blend" from when the bike was new..My question is..!! Would it be ok to run full synthetic on this bike..?? I run full synthetic on every piece of machinery that I own (Harley,Cars,Boat, Etc.) but I read somewhere that running full synth on a dirt bike somehow causes clutch slippage or something like that. Is that B.S...?? or a legitimate "fact", please help..!! much appreciated..!!