Dex cool vs antize1/28/2024 ![]() 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.Ĭan DEXCOOL organic acid antifreeze be mixed with ethylene glycol antifreeze? 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 "LongLife®) forced the retraction of that term form the DEXCOOL, Texaco and Caterpillar® packaging. Haven't seen Valvoline Coolant anywhere but i've had a good history with Valvoline Products so I might look for it.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. Theres probably brown sludge in there that i'm gonna have to flush out with some chemical flusher, i'm looking at a good chunk of the day to do this cause I wanna make 100% sure I do it right the first time. I thought of using a different coolant for the Saturn cause of the Aluminum parts if the standard Peak Green will work well I'll use it cause it's cheaper anyway, just basically looking at long term longgevity here all I know is I have to do something soon cause from experience with other cars brown rusty looking coolant is never a good thing (there is still a hint of green to it but not much) and often means the system was neglected somewhat. I was also looking at Peak Standard or Peak Pre Diluted Green coolants (The Peak PreDiluted is what I use on our two Ford's but they have older Cast Iron Engines which are practically bullet proof so I don't worry about them). Reason I asked about the Prestone Yellow was cause it says it can mix with any coolant out there, DexCool or Standard Green, i'm just not one that likes to take chances with his car. GM stopped doing so and it caught up with them on the 3.8l engine. It was "normal" practice to add pellets to the coolant fill at the vehicle plants a few years back (some manufactures still do). However, the pellets will migrate to the point of the leak and swell - thus stopping the leak. I can't get into specifics, or I could get myself into trouble. I am not sure what the hose people did.Ībout the pellets, there was a TSB for the 3.8l, which saw leakage on the upper intake gasket. Thus, you'd be taking a chance switching from "green" to "orange" on an older GM model. We started to switch to more expensive materials like EPDM and HNBR to combat this issue with the new coolant. It was found that silicone gaskets would take a faster compression set (thus a loss in contact pressure on the joint) with the OAT coolant. ![]() During compatibility testing, we used Texaco, Intac (which GM did not release to production), and Prestone OAT coolants (OAT = Organic Acid Technology - the orange stuff - which is also glycol based with a different additive pack). For years the industry used silicone gaskets to seal the green (ethylene glycol) coolant. I also read something about pellets needed to be added which you have to get at the dealer?!? ook Is that really needed or can I just get away with using the Prestone Yellow at a 50/50 coolant water mix?įrom a sealing standpoint, it is best to use the coolant that your engine came with. ![]() Dang old thread, but nontheless it raises a question for me. ![]()
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