If you mean what brand of oil I suggest Castrol Avecto 10w40. It's all I run in my 200s and I beat that thing like I hate it. In the last three engines i've had in the bike I haven't had problems with the clutches or the trans gears, and none of them have locked up on me so it seems like a good oil.
1985 ATC125M: Parts
1985 ATC200S: 84 200S Bottem end, 200x Head, 200x Carb, S&S Cycle Exhaust, Wiseco 10.25:1 Piston, Reground Cam with About 1mm more lift(unknown specs).
1988 TRX250X
1983 ATC200E: Total Pile.
"Bout Tree Fiddy" Master of Thy 22RE