Correct Oil For Mercruiser 5.7L Flat Tappet Cam Engine?
Updated- May, 2021 A reader asks: I’ve got a 1988 10 meter prowler with twin-inboard Mercruiser 5.7L engines that produce 260 horsepower each. As these engines have flat tappet cams, what would be your engine oil recommendation? Our Answer: GM produced 5.7L (350 c.i.) engines with flat tappet cams for Mercury up until 1995. Making…



