Posts: 3479
Location: Elk River, Minnesota | Hiya,
If memory serves me correctly, the 80W-90 is just a multi-weight viscosity oil. The two numbers have to do with temperature of some sort. Please don't quote me directly on this but I believe it is something like it acts like 80 weight oil at cold temp and 90 weight oil at high temp in terms of viscosity, or it's ability to flow.
Regardless, so long as the marine gear oil fits under your specifications for the outboard, you should be just fine. I happen to run amsoil synthetic marine gear oil, which I believe would also fit your application. This runs at 75W-90 so it should suffice for the needs of 90 weight oil and any extreme pressure situation as well.
https://www.amsoil.com/shop/by-product/gear-lube/universal-synthetic...
Steve |
