Do not want to sound like a smart ass, but after owning two S class MB's I learned a tough lesson, these cars are ultimate in creature comfort but they are designed with $$$ no object. The official labour for this job if I am not mistaken is about 26 hours, that is more than 3 days of labor in a qualified shop. If you are going to do this youself, by all means do not go cheap on parts, you do not want to redo the job again.

Vahe
240D 77 350K