Check your owners manual. My 09 W211 OM642 calls for "MB sheet number" 229.51. So go here and pick anything with a check mark: https://operatingfluids.mercedes-benz.com/sheet/229.51/en

I have been running PENTO HIGH PERFORMANCE II SAE 5W-40.

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2009 E320 Bluetec - 242k miles and a work in progress!