I've got an old tractor (1968) with a Briggs and Stratton either 9 or 10 HP motor on it. I can't seem to find any oil dip stick, drain plug or anything and it needs to be changed because it sat for 5 years. I also have no idea what the capacity or fluid type is. It's off an old Simplicity, and the only reason I'm not posting this in the Simplicity forum is because it's really dead over there. Any help is appreciated.