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i have an 1978 85hp merc with tilt and trim.would like to know what oil to put in tilt and trim. pump says to use m.s. grade s.a.e.20w,not sure what m.s. grade means. can i use non detergent s.a.e.20w motor oil ($3.00 a quart) or do i have to use the expensive oil that the marina wants to sell...
