Just a little higher, like an 1/8" or something probably will not hurt anything. If it is like a half quart or more overfilled, the oil will probably foam, not a good thing.

You might do a search on this. I remember Benzmac offering a very detailed post on this very thing some months back.

Good luck,

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Larry Bible
'01 C Class, Six Speed
'84 Euro 240D, 523K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in
Mercedes automobiles