Why MB Windshield Washer Fluid?
Why should I add MB Windshield Washer Fluid?
What is special in MB windshield washing system?
Why not ommercially available premixed windshield washer?
In the manual (1992 300D):
MB Windshield Washer Concentrate "S" and commercially available premixed windshield washer solvent/antifreeze
1 part "S" to 100 parts solvent
(40ml "S" to 1 gallon solvent)