I always change the oil after a good run to heat the oil, and change the oil hot befor it has time for the crap has time to settle, and the same for the tranny oil,. the two bolts on the left side one is drain and the other is the wire mesh filter , remove the filter with needle nose plyers very gentle it comes out easy, and blow clean and do not over tighten it is alum. nut cap, use reg. oil for break in, I switched to syn. oil at 1,000 miles,.