Thread: Block drain plug
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Old 10-09-2011, 06:42 AM
Ferdman Ferdman is offline
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Join Date: Aug 2002
Location: Southeastern PA
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Ken, before flushing the cooling system install a new thermostat. A new thermostat resolved a sudden increase in our 1992 300CE's engine operating temperature.

No doubt you realize the optimum coolant is a 50/50 mix of MB coolant (or Zerex) and water with a ph between 7 and 8. If the ph goes above 8 the coolant mix should be changed.
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