How do you check rear differential fluid level on Mercedes Benz 190E?

To check the rear differential fluid level on a Mercedes-Benz 190E, first, ensure the vehicle is on level ground. Locate the fill plug on the differential housing, typically found on the side. Remove the fill plug using a wrench; the fluid level should be just below the plug opening. If fluid seeps out when you remove the plug, the level is adequate; if not, you may need to add the appropriate differential fluid until it reaches the correct level.