For you guys with wet clutch bikes, here are the results on my Arctic Cat 500 Manual shift . Mobil One 0W40 Euro Formula, Fram filter, K&N air filter. Lots of steep trails, lots of dust. Put oil in at 5,500 miles, changed at 6,000 miles. The old AC 500 holds 4.5 qts of oil, btw. Runs between 150F and 170F. Used no oil and the oil looked amber, not black. Oil is cheap, so I’m sticking with the 500 mile change interval. Anybody else use Blackstone Labs? BTW, AC used a 500cc Suzuki in my ATV.
