Hoat stands for Hybrid Organic Acid Technology.
This chemistry combines the best of conventional and organic acid-based chemistry.
It will provide the ultimate protection against rust and corrosion, for our cast iron blocks/aluminum head Jeeps, with plastic impeller water pumps.
Hoat coolant should be re-newed every 5 years.
Always refer to your owners manual which can be downloaded free, regarding coolant, gear lube, fluids specs etc..
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Last time I had the coolant serviced it was by Jeep dealer.
They have a re-circulating machine, which removes all the old and installs the new.
Distilled water and pure (not pre-mixed) Hoat is mixed in their machine for a final temperature rating...
I asked for 65% Hoat & 35 % distilled water, which gave me -58 Celsius.
I Always use an anti-freeze tester before winter, to ensure that the Jeep is still within specs.
I use Dealer Hoat for top ups, like when I replaced the top rad hose.
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It is full strength, not a premixed.