thanks for all the info. I already have my mb brand coolant so I think I'm going to stick with that. Can I just open the plug on the radiator, drain the old fluid out and then run some water from the hose through the coolant resevoir. It doesnt get that cold in dc so I think ill go with one gallon of coolant and 2 gallons of water. Is there another coolant drain somewhere onthe engine?

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W126 1983 300SD 286,000 miles and ticking
Baby blue exterior Grey MB tex
Recent work:
Replaced air cleaner mounting brackets and heat shields
Replaced alternator, fan and power steering belts
Replaced positive battery terminal
Replaced negative battery terminal and cord
New Duralast Battery

My car needs work.