dt125 fuel in gearbox

[hansieviljoen]

Hi ma name is Hansie I'm driving a dt125 and I wanted to change the gearbox oil. What oil must I trow in and why can it be that there is fuel in oil.thanx alot

[Airhead]

The right hand side crank seal needs replacing hansie that is why there is fuel in the oil.

What year and model is the bike? (update your profile)