On my engine there are 3 screws on the Starboard side of engine leg, the top one and the bottom one are same ie; flat screwdriver needed, there is a middle one which is star headed, I noted in Clymer manual referance to a smaller engine not to touch this as a major job is created! I have oil to change but wonder if Bottom to drain, top to fill, Ignore middle one which is star headed? Engine is 1984. thanks for now J.B.D.