In engines that do not have oil bath clutches, any oil will work - JASO rated, API S (gas engines) or C (diesel engines) - the only recommendation I adhere to is to use the type of oil recommended by the manufacturer of the engine. If the mfg. recommends synthetic, use synthetic - if mineral oil is recommended, you can use synthetic after break in, but the engine may use more oil - as to break-in? If broken-in on synthetic oil, break-in will take about 4 time s longer than on mineral oil, but the engine will last longer and oil changes need not be as frequent.
Shop Owner and Mechanic with over 50 years experience