Would anyone know what is the OEM weight and what is the thinnest oil I can put?

 

bumpin it up!!!!

 

bump bump!!

 

stock oil is something like 10-30 motor oil + some friction modifiers. You do not want to put thinner oil in, it won't buy you anything. All it will do is increase wear on your syncros, bearings, and gears. 10-30 motor oil is pretty damn thin anyway, just leave it stock or replace with amsoil MTF if you have to fiddle with it.