Did I read correctly that you are using a 75% antifreeze to 25% water mixture?
That is awfully high on the antifreeze. Try changing to 50% or even 40% antifreeze.
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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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