![]() as long as they were frequently flushed and replenished. ![]() I don’t know what was wrong with the old coolants that were replaced every 2 years as they always worked well in my cast iron block, alloy head, copper & alloy radiator vehicles without issue. Earlier this spring, had a mechanic notice an oily sludge, mixed in with the coolant on the dipstick going into the coolant reservoir. the yellow sludge is dissolved and deposited plastic (which doesn’t sound ideal). So to answer your question, with some speculation as I’m no expert, it may be the DexCool used in our LS3s results in the plastic overflow tank and plastic dipstick going a little gooey over time while the rest of the system suffers small leaks as Ford found out. Then there is the issue of mixing different types of coolants during top up which can possibly increasing corrosion within the cooling system (not so good).Īll this makes for a rather interesting subject which I’d love to know more about. Softening (and the resulting distortion) was reported by Ford, which encountered gasket leakage problems when it tested a DexCool-type formula on its V8 engines”. The other interesting bit is “The inhibitor 2-EHA poses another issue: It's a plasticizer (softens plastic), so it has been blamed for coolant passage gasket leakage. These organic acids are very stable and last a long time, although they take thousands of miles to become fully effective in protecting coolant passages”. To quote the article, “All DexCool-approved coolants to date use two organic acid rust/corrosion inhibitors, one called sebacate, the other called 2-EHA (which stands for 2-ethylhexanoic acid). Variants of OAT coolant, including DexCool in some instances, have/are also been/being used by other manufacturers. This indicates GM uses an organic acid technology (OAT) coolant known as DexCool within their vehicles. Was curious so read up a little about long life coolants here.
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