Date registered: Dec 2005
Vehicle: E320/E250 Bluetec Ford F350 6.7l
Location: V E G A S
Mentioned: 30 Post(s)
Quoted: 2003 Post(s)
Opening block drains can open whole can of worms, while you still have good amount of coolant left in in the passages.
In US Walmarts sells Distillate Water for 80 cents a gallon, so I buy 4-6 gallons of it, drain old coolant at radiator plug, refill with DW, drive for few miles, drain, refill and depends on contamination repeat 3-4 times and at the end I put 1 gallon of MB coolant and top if off with DW.
I live in cold climates, so getting 50% coolant dilution is not necessary, so using 1 gallon standard bottle of coolant makes what it makes.
Beware that those models do have chem pack in the system, who needs to be replaced as well. In US it comes build-in at coolant reservoir, so whole new reservoir is needed.