One or two more things.....

1.) Don't over fill it. I'll find out the diff. oil capacity (1.4Q on w210). In case, you can't, then collect the drain and refill with the same quantity.

2.) If possible collect every drop of fluid, that gear oil smell is almost impossible to get rid off. Watch out for your clothings and the garage floor.

3.) Refilling may not be as easy. Therefore I suggest investing $5 in a hand pump. Makes getting the oil in much easier.

4.) use socket extension for easier access, and pipe extension to make getting out the plugs a piece of cake.

I use mobil 1 full synthetic gear oil of the correct grade as stated in your manual.