Courious for the recomendations on this outboard. I'm a big fan of synthetics Blue Marble, Opti2, Amsoil, etc. I do have a dirtbike racing background and ran synthetics religiously for dependability. But with synthetics usually means a lean mixture or as rich as you want...with me leaning towards the lean side of that scale for peak performance of my bikes and quads. This outboard is old and I have little to no history of its past. There is a wiesco sticker under the cowl which hints to a rebuild somewhere in its 45 years of life...been told this is a motor to keep on my speedboat...and don't want to burn it up. Any ideas! I'm new the marine side of life and new to this forum...thanks for having me.