What Bigcat said.
I would stick with the manufacturers oil, especially on newer engines. Even my buddy stays with yama oil on his 1987 150HP.
All I use is the ram oil on my ficht ,why take the chance for a few $$.
Also if you have a problem, they could blame you for using the "wrong" oil. (and maybe have a warranty problem), although they probabaly all buy it from the same company. Merc, Honda, OMC etc..do not make their own oil.
I found the ficht oil at the boat show for 18 bucks, so I stocked up.
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