Here's my unsolicited opinion
its fine, run it
sweet jesus the oil people were using 30 years ago was absolute ass
also dont think for a second a marine outboard doesent get all sortsa hot in there lol
Anything made after 1990 is way better then what people were putting in thier bikes in the 70's and whatever tc3 is perfectly fine for your regular guy bike.
in the 80's i had a suzuki dt 185 that was oil injected ( can i say that on this forum board without everyone going all fucking nutty? ) and i was a silly kid. I used to pour whatever we had in the garage in that oil resivoir, then myself and 5 kids used to go camping way up in the woods in the hot summer on my dirtbike, and go beat the living bejesus out of it in the hot 110 degree heat of summer...
running on atf fluid, 10w/40 , straight mystery oil, gear oil and probably furniture polish at one point. Ok the furniture polish is a joke but everything else is not.
Kitted crazyness run motul or some nice yamalube or something.
People get to anal retentive about designer oils.
My boat has a 1984 mercury on it, and it came with an old gallon of evinrude 2 stroke. Everytime i go fill the boat up everyone looks at me like im mixing cats and dogs for breeding.
its just oil, everybody CALM DOWN