Re: Oil Mixture for a 1987 90hp Evinrude
The actual brand of oil doesn't really matter, I have used Speedway branded oil for years, just make sure it says TCW-3 and is OUTBOARD OIL, the oil for chainsaws and weedwhackers is different as they run at alot higher temps.
It works out to 2.7 ozper gallon but I always go 3oz just to have a bit more oil in the engine.