just wondering if there are 2 pugs on my gearbox, one to empty everything out and one where you put fresh oil in.

just wondering cos this is the only plug i can find and there is a shite load of oil pouring out when i opened it. this makes me think its not the one i should be topping up with...?

here is a piccy....



also, what grade oil does the MTX-75 box use? i wanna put something slightly thicker in it.