sprinter 208cdi rear axle leak and oil help.

[spike2450]

hi all
2000 sprinter 208 cdi 2.2 diesel
Just got my first sprinter and wow i'll never look elsewhere again, can anyone tell me the weight of transmission oil for the rear diff / axle.

I have an oil leak from the end of the axle which is running down the inside of the wheel.

Is this a diy repair or a bigger job for a garage.

any help would be great
regards