My 1993 300E (3.2) with the M104 engine, ran consistently between 87-90, which is exactly the temp range the engines were designed to run at.

Any lower than that is not normal.

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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".