Quote Originally Posted by TygerTung View Post
I think you can only use castrol R for a certain time in your crankcase before it goes bad.

I think you can get vegetable oil based chain/bar oil for chainsaws now, maybe that would be a good choice? It is very sticky though.
They also make a special castor oil based hydraulic oil, like the chain bar oil they are special biodegradeable lubricants for use in sensitive (drinking) water catchment areas. When they biodegrade they become thick with sludge and as the long carbon chains break they become acidic with FFA free fatty acids.