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DieselPetrol? Diesel?
Mercedes measured it said okHow and when are you measuring the oil level?
On Diesel engines the oil quantity sensors are very sensitive.
If you fill the engine with oil up to the max mark when hot (if the engine has a dipstick), it's technically fine but will still trigger the warning from time to time.
It's best to fill up with oil so that when it's hot it's no more than half-way between and the min and the max marks.
If you don't have a dipstick, you can try removing 0.5L of oil by siphoning it out then checking again.
The other possibility is that the oil quantity sensor (or the wiring to it) has an intermittent fault.
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