If you are going to use this for air conditioning do not put anything in there except refrigerant oil. The crank case is not seperate!!!. And by the way never take that plug out with a full charge of freon. If you do bye bye freon. And be careful when you screw that plug back in . If you over tighten it you will crack the case. I know from experance. I can't remember how much oil goes in the sump of the comp but I rember you measure it with a coat hanger.