I like to use BelRay SuperClean Chain Lube. It's good stuff. Works with O-ring chains, keeps the chain looking brand new, doesnt attract dirt, and doesnt fling off. Just clean the chain real good, then roll the quad foward and spray it on the inside of the chain. When spraying it on the inside, centrifigual force will sling the lube through the chain, getting all the parts you cant get, and wont fling off as if you were to spray the lube on the outside of the chain. Essentially, all the lube does is keep the o-rings lubricated to prevent dry-rotting and premature wear. Once the o-rings are gone, so is the lube inside them!