![]() I'm looking for long life coolant, and I plan to flush all the old stuff out (I rebuilt some engines and everything is new). I think later model Nissan (all aluminum engines) might have moved to blue. I don't know the OEM color of the Nissan Xterra/Frontier in 2000-2004, but I'm guessing green. It looked like many of the other manufacturers (Zerex, Pentosin, etc) are also likely using the exact same product base, but just changing the colors to match OEM color? Is that correct? I was confused reading a label of Pentosin Pentofrost suggesting the color was even tied to a particular year range. Aluminum heads, radiators, and other components, and cast iron blocks. Most of my applications are Nissan Xterra/Frontier (2000-2004). What did they lose in the product to make it no longer hybrid? Did they remove something that was previously inorganic, such that the HOAT became phosphated OAT now? I think the Japanese (Asian) coolants are likely all PHOAT now, but I became confused with Prestone's POAT (not PHOAT). ![]() Is Prestone simply not publishing the chemicals for corrosion inhibitors? The "all-makes" gold appears to just contain ethylene glycol and diethylene glycol (and proprietary inhibitors). I know there is quite the conversation on the topic of 2-EHA coolants, but I'm not sure how the "all-makes" Prestone gold compares to the older 2-EHA coolants. I've recently been researching coolant technology and decided I wanted to try and find an affordable way to get the type of coolants the manufacturers are specifying, rather than defaulting to the 1 gallon concentrated gold-colored Prestone I've been using that claim to work for "all makes and models".
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