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DexKool. Marketing strategy. Designed for newer aluminum radiators. Designed to separate the yuppie from $$$; also requires total flush of green ($$$) Not worth the $$$ on farm/construction equipment. Reasons for changing and flushing coolant. Particulates swirl in the cooling system, eroding and lodging. Acidic levels rise, weakening hoses. Deposits heat and cool, solidifying and clogging radiators. Occasionally, getting these floating eroding conaminates out is worthwhile. A coolant filter is optimum, but in the long run, flushing the coolant system is fairly cheap.
Everything said so far is good advice. The color of the (green) coolant is a good clue to flush need. Bright green---good. Green-ish--Brown, flush!
In the military, we have worked with antifreeze recyclers. One you can plug into a heater hose, and run the equipment for ten minutes and totally filter and replace the inhibitors. Ethylene-glycol, the root ingredient of antifreeze is clear, the green or orange color, is just tha---color. The recycler removes inhibitors, color, and also completely filters, the remaining glycol and water is clear, then the inhibitor lubricant package is added back which gives the coolant color.
For used antifreeze, additionally, we use coolant test strips, which test for freeze-point concentration and acidic level. Inhibitors can be added just once bringing the acidic level within tolorance, then thereafter, the coolant must be flushed.
Equipment that is used on a continuous basis, and does not sit, will not rust as much as the idle stored equipment, requiring less flushing.
Wayne
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