The 20 w 50 oils are classified as motorcycle oil
, most are...They don't add the friction modifiers
so it is safe to run in your primary...other wise the clutch would slip....as far as a brand name
I don't know, as long as it's not a cheap oil
, I would go with synthetic
, it's tough..I think they make that stuff from natural gas..
The price is dropping on it too..