One of the reasons they stoped putting the the 606 into the W210's in 99 is they redesigned the hood so the engine wouldn't fit anymore. MB engines are usually very expensive I bet a new CDI engine runs at least $20k from the dealer figure another $20k for the right electronics, new trans, custom driveshaft, custom front springs, custom radiator. Not to mention the resale value will go down.

It would be cheaper to buy a E320CDI. Maybe you can get them with AWD now?

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200