2008 Mercedes SLK-Class Owner's Manual - Page 459

Technical data Fuels, coolants, lubricants, etc. Windshield washer system and headlamp cleaning system* Both the windshield washer system and headlamp cleaning system* are supplied from the windshield washer reservoir. The windshield washer reservoir has a capacity of approximately 7.4 US qt (7.0 l). Refill the reservoir with MB Windshield Washer Concentrate "MB SummerFit" and water (or concentrate and commercially available premixed windshield washer solvent/antifreeze, depending on ambient temperatures). For temperatures below freezing point, use MB Windshield Washer Concentrate "MB SummerFit" and commercially available premixed windshield washer solvent/antifreeze: 1 part "MB SummerFit" to 100 parts solvent (1.34 fl oz [40 ml] "MB SummerFit" to 1 gal [4.0 l] solvent) Warning! G Washer solvent/antifreeze is highly flammable. Do not spill washer solvent/antifreeze on hot engine parts because it may ignite and burn. You could be seriously burned. Windshield and headlamp washer fluid mixing ratio For temperatures above freezing point, use MB Windshield Washer Concentrate "MB SummerFit" and water: 1 part "MB SummerFit" to100 parts water (1.34 fl oz [40 ml] "MB SummerFit" to 1 gal [4.0 l] water) 458