Quote Originally Posted by pepi View Post
FWIW 20-50 in not a good choice, stock 350 stick with the spec weight viscosity. If it has some whoop-ass and you lean on it often, Castrol 20w-40 will work great.

Might also add some Marvel Mystery oil the gas tank, good for valves and guides.
Another board suggests adding a quart of significantly thinner oil to balance out. Any suggestions?