![]() My experience with unleaded fuel is that it only causes problems in old high-performance cars and hot rods that have engines with high compression ratios. And finally, the alcohol in gasoline attracts and mixes with moisture sucked into your fuel tank through the tank vent, and can cause problems after long storage. Alcohol will also damage the lining material that is often used to seal old gas tanks and will cause it to gum up the fuel delivery system. Also, gasoline with alcohol can cause problems with old hoses and fuel lines that were not designed for it. Modern gear oil can cause damage over the long haul. 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.” Answer:Īs I have stated before in Mechanic on Duty, I use only GL-1 gear oil in my old cars in order to save the non-ferrous metals in the synchromesh cones and other parts. “Acceptable brands are Peak, Peak’s HD Product “Sierra,” and Zerex Original Green in the white container. None of us wants to pull and rebuild our cars’ engines. Brands to be avoided are all Prestone lines and Zerex’s G-05 in the Gold container. Also, the product may be labeled “Safe for Older Cars”-meaning 10 years old at most. You cannot tell by the color of the antifreeze if it’s safe to use. “The antifreeze that can be used safely in our cars uses an olderfashioned Inorganic Additive Technology (IAT) additive. The “Silver Ghost Association” Rolls-Royce people have documented massive cooling system failures apparently caused by these antifreeze products. It attacks the gaskets and gasket cements in our cars, causing major leaks, forcing ultra-expensive repairs. “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. ![]() Instead, fill them with water and a can of rust inhibitor. With earlier cars that have cast iron blocks that were made for water only, don’t add coolant. ![]() If you add air conditioning to a car that that didn’t come with it, you will be adding a heat load to the cooling system that will have to be dealt with. So what is the truth here? Below is the message my club sent out: It has been reported that the wrong type will attack gasket material and a local radiator shop says it will eat away at traditional copper radiator solder joints. In my case none of these things have happened.Īnd now we have the antifreeze warnings. And then there was the 10% ethanol gasoline that was incompatible with our older cars. The same seems to be true for certain gear oils that were reported to “eat” away at brass or bronze gearbox components. Now, having used it for over 40 years, at least for me, none of these predictions have borne out. I recall the hysteria that surrounded the introduction of unleaded gas and the doom and gloom predicted that it would destroy our older cars’ valve seats. I always take these warnings with a grain of salt and like to get a second or third, opinion before I rush off and take action with my fleet of six British cars ranging in age from 28 years to 67 years. My local vintage car club has recently forwarded the following message they received from a national club newsletter.
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