Hi All......I know this is going to be a stupid question, but what kind of oil should I use in the transmission of my Minarelli v1 engine (where the clutch is)? I know that the manual I saw says SAE 20.......but can anyone recommend a common brand? I googled SAE 20 and got a bunch of 5W-20 and stuff like that. Any recommendations on a brand and or type would be helpful. Also, how often do you change the oil in there. Thanks in advance for any help and apologies for my lack of knowledge. Thanks