I see that you replaced the water pump with an OEM one. I have heard that anything but a genuine Mercedes (not just the same company that makes theirs) won't cool as well because of a proprietary impeller design. When, let's say, Graf? makes a water pump for Mercedes with the star stamp on it, they use, let's say, 8 fins on the impeller, whereas, when they make ones to sell to the general public, have to only have 6 fins because only the ones they sell to Mercedes can have the 8 fins. It's sort of like that.

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DON'T MESS WITH MY MERCEDES!


1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles