W211 e250 differential oil

Hi, My local Mercedes dealer says front and rear differential oil is lifetime. I don't believe it and would like to change it after 15 years. What is the best oil to use and what is front snd rear capacity? Is it the same for both? 2007 e350 4matic.

Hi,
My local Mercedes dealer says front and rear differential oil is lifetime.

I don't believe it and would like to change it after 15 years.

What is the best oil to use and what is front snd rear capacity? Is it the same for both?

2007 e350 4matic.

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