I bought a 19ft. with a mercruiser 170 4 cylinder engine. It had sat for 4 years without being run. After fixing ignition and wiring I got the motor running. Oil pressure seemed high 75-85lbs at cold idle, 50-60lbs at warm idle, going to 75-80 at 2000 rpm warm. I've changed oil and filter--no change-- and hooked up a mechanical gauge to confirm readings. Is this normal for this engine or is this too high? I've got a feeling the relief valve in the oil pump is stuck, but don't want to pull the engine if the is this normal for that engine? Any advice is appreciated.,
