[diesel_mercedes] recommended coolant & flush

 

Hello All

My 1978 300D is running hot, about 220 degrees Fahrenheit, at high speed on a very hot day. I have replaced the thermostat & radiator cap. This helped a little, but not enough.

Is there a recommended antifreeze and radiator flushes? I have read that the cooling system is sensitive to pH.

thank you
Rodger

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