How do you know when an acid flush is needed?
I am about to replace the coolant in my 1985 300D. I bought the car last year and have no idea whether the system has ever been de-oiled or flushed with an citric acid solution. The car has no problem maintaining a proper temperature.
Should I assume that the system needs the de-oiling and citric acid flushing? Or can I just flush with water and fill with MB coolant?
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