How much engine oil does a 1982 Honda nighthawk 450 take?

An 82' nighthawk 450 takes 2.6 quarts of of sae 10w-40 SE or SF grade oil... Although I've heard from friends who ride say you should get motorcycle oil or Honda specified oil. The nighthawks have a "wet" clutch system and regular car oil will burn out your clutch.. that's from a ATV technician..