How do you tell which is pump oil hole for Sears pressure washer model 580-752550 and how much pump and engine oil to add?

I have found you add about 4-5 oz of pump oil, the black plug between the hose outlet and hose inlet is the pump oil. As for the engine oil when I changed it I measure how much comes out then I put that much new oil back in it shouldn't be more than 5-6 oz. hope this helps...............................