autoluke Posted October 20, 2011 Share Posted October 20, 2011 Before winterizing a 1929 Packard and 1941 Cadillac, I want to be sure to use the correct anti freeze. Could the newer Extended Life product ( Prestone ) be harmful ? Link to comment Share on other sites More sharing options...
1937-44 Posted October 20, 2011 Share Posted October 20, 2011 Hi,If you do a search for antifreeze on this site you will find a thread dealing with modern antifreeze posted by trp3141592 on 11/7/2010. The main information in the post in my opinion is:"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 anti-freeze 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."I use (Original Formula Green Peak Antifreeze), but there are many other opinions and choices. Link to comment Share on other sites More sharing options...
Restorer32 Posted October 20, 2011 Share Posted October 20, 2011 We recently called Prestone Technical Support re what antifreeze to use in a '59 Cadillac. They said to never use extended life antifreeze in any car older than 10 years. We trust their opinion. Link to comment Share on other sites More sharing options...
poci1957 Posted October 20, 2011 Share Posted October 20, 2011 Good to know. Link to comment Share on other sites More sharing options...
ted sweet Posted October 20, 2011 Share Posted October 20, 2011 why 10 yrs old when those cars came with an extended type? Link to comment Share on other sites More sharing options...
autoluke Posted October 22, 2011 Author Share Posted October 22, 2011 Any suggestions to find a manufacturer of the older phosphate technology ? Link to comment Share on other sites More sharing options...
1937-44 Posted October 22, 2011 Share Posted October 22, 2011 The last year or so it has become easier to find the non extended life. I buy my Peak Original Green Antifreeze at my local Kmart. Autozone is now carrying the non extended life here as well. Link to comment Share on other sites More sharing options...
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