Coolant type - HOAT necessary? - Page 2 -
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post #16 of 18 Old 08-19-2013, 08:34 AM
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Aren't most if not all threads that show pitted/corroded water pump/timing chain cover on the 4.7 have green coolant?

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post #17 of 18 Old 08-19-2013, 11:39 AM
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Originally Posted by Merc1973 View Post
Aren't most if not all threads that show pitted/corroded water pump/timing chain cover on the 4.7 have green coolant?
"HOAT" (Hybrid Organic Acid Technology) antifreeze is usually dyed yellow but may also be dyed orange or green. HOAT coolants are currently used by Ford, Chrysler, Mercedes, BMW and Volvo. ...When OAT coolants break down they form minuscule water bubbles that will beat a water pump impeller to death. Chemists admit that is is no better substitute for the old silicate stuff but environmentalists have pressured the government into a coolant with a 5 year life to reduce waste disposal.
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post #18 of 18 Old 08-19-2013, 01:51 PM
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Does HOAT contain ethylene glycol or propylene glycol? Just wondering if it's safe for pets.

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