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Mercedes-Benz Sprinter reduce old level error

A message flashed for about 10 to 15 seconds on the dash of a Mercedes-Benz Sprinter at work saying something along the lines of "Reduce oil level". It was quick so I'm not sure what it said. The vehicle gets serviced regularly by a well known reputable company. Is this common?

If it happened shortly after a service it's probably been over-filled when the oil was changed. Draining a small amount of oil out of the engine should fix it. If that's not the cause it could be a faulty sensor, and it might need replacing. If it's happening regularly, and you know the oil fill was correct it could be diesel fuel getting into the oil through a faulty injector.