Thats ATV and Motorcycle oil.
Boat engines and atv's are not the same engine by design. They rev differently and run under different loads.
I would not use it in your boat.
Try and sell it and buy the correct oil.
I would use what Mercruiser recommends or any good grade of oil you use in your car
Don
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1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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