Checking Fluid Level
WARNING: This page is about a different car, the 1986 Mercedes-Benz 300SDL, 1986 Mercedes-Benz 300E, 1986 Mercedes-Benz 300D, 1986 Mercedes-Benz 190E, and 1986 Mercedes-Benz 190D. However, it is still accessible from the selected car via links, so may be relevant.
Ensure fluid is even with bottom of fill hole.