At what mix is the there too little of either inhibitor to protect the engine? As a precaution, both GM and Caterpillar instruct that contaminated systems must be maintained as if they contained only conventional coolant. The other question is a concern for dilution of the protection packages. If the coolants become mixed with DEXCOOL, however, one study showed a possible aluminum corrosion problem in certain situations. Most leading technologies will work very well when used as intended, typically at 50% in good quality water. It is ethylene glycol based antifreeze! The concern with mixing comes from the fact that there are very different chemical inhibitor packages in use. Frequently Asked Questions:Ĭan DEXCOOL organic acid antifreeze be mixed with ethylene glycol antifreeze? GMC® medium trucks equipped with Caterpillar engines, have been getting a nitrite-added form of DEXCOOL (NOAT) to insure protection against wet sleeve liner cavitation-erosion. General Motors® has been using this coolant technology in their cars and light trucks since the start-of-production of the 1996 model year vehicles (except Saturn®, which began in 1997). Other companies have obtained similar patents, by varying the mixture somewhat and by using similar, but not exactly the same, chemistry. The combination of a mono and dibasic carboxylic acids permitted Texaco to obtain a patent on the specific combination. It was originally called “Long Life”, but a lawsuit brought by Warren Oil, who markets a fully formulated coolant under the brand name “Long Life®” forced the retraction of that term from the DEXCOOL, Texaco and Caterpillar® packaging. 01.010 Dexcool Frequently Asked Questions Introduction:Įquilon (owned by Texaco® and Shell®) markets a European coolant technology (OAT) that consists of ethylene glycol inhibited with a combination of sebacic acid and 2-ethylhexanoic acid supplemented with tolyltriazole.
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