It doesn't say anywhere on the bottle, but I believe it is a 10:1 concentrate.
Mercedes-Benz Summerfit Windshield Washer Fluid Concentrate (000-986-20-00-09) : Automotive
Mercedes-Benz A002986147109 for sale online
Mercedes-Benz Summerfit Windshield Washer Fluid Concentrate (000-986-20-00-09) : Automotive
Genuine OEM Mercedes Benz Winter Fit WindShield Washer Fluid Concentrate 1 Li
CONDITION:, New, BRAND:, Mercedes-Benz, WARRANTY:, Lifetime, MANUFACTURER PART NUMBER:, 002986147109, FITMENT TYPE:, Direct Replacement
Genuine Mercedes WinterFit Windscreen Washer Concentrate 1 Liter OE 002986147109
Mercedes-Benz Genuine OEM Winter Fit Windshield Washer Fluid Concentrate 1 Liter. : Automotive
Designed specifically for Mercedes-Benz specifications Easy to apply
Mercedes-Benz Genuine OEM Winter Fit Windshield Washer Fluid Concentrate 1 Liter.
MB windshield washer concentrate S - Forums
GENUINE MERCEDES-BENZ WINDSHIELD Washer Nozzle Jet Right (1998-2003) 2088601147 $42.99 - PicClick
Mercedes-Benz WinterFit windshield cleaner, 1 liter
Mercedes-Benz A002986147109 Winter Fit Windshield Washer Fluid Concentrate - 1L for sale online