The simple answer is the max the oil level should be is the max level on the dipstick, that what it is there for. Whilst I accept that a few milimeters will do no damage its a bone idle mechanic who cannot fill the engine to the correct level.
But are you checking the oil correctly? Different makes have different methods. On some its a cold engine after an overnight wait, on others it a hot engine after standing 5 or 10 minutes. The difference can be quite noticable.
But if its been checked correctly and its overfilled get them to drain some.
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