Larry Swanson (firstname.lastname@example.org) sent this out as a matter of information. Does anyone have more definitive guidance on the Extended Life Antifreeze? Trying to get additional information on this issue. . . .thanks Curt
Off the AACA forum: Extended Life Antifreeze
Information was just published in the Auburn Cord Duesenberg Club Newsletter
concerning the use of "extended life" antifreeze in cars over 10 years old.
In a nutshell--don't do it! Under NO CIRCUMSTANCES should an "Extended
Life" antifreeze, which utilizes Organic Additive Technology (OAT, H-OAT, or
N-OAT) as one of its chemicals, ever be used in our cars over 10 years old.
It attacks the gaskets and gasket cements in our cars, causing major leaks and forcing
ultra-expensive repairs. The "Silver Ghost Association" Rolls Royce people have
documented massive cooling system failures apparently caused by this antifreeze
product. Antifreeze that can be used safely in our cars uses older-fashioned
Inorganic Additive Technology (IAT) additive. You cannot tell by the color of the
antifreeze if it's safe to use. Also, the product may be labeled "Safe for Older
Cars"-- meaning 10 years old at most – “the over 10 years old covers most of the
Hawkeye’s cars!!” Brands to be AVOIDED are all Prestone lines and Zerex's G-
05 in the Gold-color container.
Avoid any "extended-life" antifreeze. None of us wants to pull and rebuild our cars' engines.
Acceptable brands are Peak, Peak's HD Product "Sierra," and Zerex Original Green in the
WHITE container. If any of the OAT, H-OAT, or N-OAT products are in your car the cooling
system should promptly be drained--radiator and block-- the system flushed thoroughly,
and IAT antifreeze installed.