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+[* black] Before filling the engine with new coolant be sure to replace the block drain plug and tighten it down.
+[* black] Use only Genuine Mercedes coolant or an appropriate formulation if using another brand. These coolants are designed to be compatible with the materials used in the W123 cooling system.
+[* black] Pre-mix the coolant and water in a clean container. Mix up a total of 3 gallons. On this car this meant using 1 gallon of coolant and 2 gallons of water, but it will depend on your climate. The system will take about 2.5 gallons of coolant/water mix at first, and then the remainder after some bleeding and driving for a few days.

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