I've read that it's a bad idea to mix coolant.
MB's coolant is unique in that it has a ph of 7, or neutral. All other coolant is not.
Using the other coolant is bad on the water pump, seals, plastic, and rubber parts.
I'd drain, flush, and refill.
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Paul S.
2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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