How many miles are on this car, and what model motor?

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A 50/50 mix will show as a protection of minus 37C [ -34F]

Thanks Arthur .... it seems all of my cars are off in the coolant ratio .... I've had the mix give protection to -10 degrees F.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)

You are a little light in the mix
Benz like to see a min minus 30C [ -22F] . which equates to 45/55 af/H2o.
Reasoning is both corrosive protection and boil point specs.
Your car actually left the factory with those specs.
On the other end , the heat transfer deminishes to the point of possible warm running conditions at 65/35 ratios.

My own thoughts are hot climates [USA] can be 40/60 with good overall results...and 50/50 for normal Winter Belt geographic areas [ USA]