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any ideas on what would be the best solution for flushing out the old anti-freeze for the v-8 5.0 ??
 

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E320/E250 Bluetec Ford F350 6.7l
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I develop my own flush system that works on all engines and is based on Distillate Water, who cost about 90 cents/gallon at Walmart.
1-buy enough DW to make 2 or 3 system fill-ups
2- drain old coolant with lower plug, close the plug and refill with DW
3- drive the car for longer distance, operating heater
4- drain the water and refill with more DW
5-if the drained water is still murky- repeat 2 -4 as many times as necessary.
6- calculate how much MB coolant you need, pour it into the system and top-off with DW, recheck level once engine comes to full operating temperature
Beware that closed thermostat will keep air bubble in the engine, so during the drive observe engine temperature and when needed - pull over and add DW.
If you suspect wrong coolants were used and you might have boiling stone in radiator - add citric acid before 2 and drive with it a bit.
 

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1989 W124 260E
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For oil in system Disodium Troxosilicate part number will be 001 986 21 71 for 500 grams
For scale and Citric Acid 100 grams per litre of coolant part no will be - 000 989 10 45 for 500 grams
 
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