So if they don’t deplete, then the coolant continues to prevent corrosion. This is because of the low depletion of its corrosion inhibitors (e.g. Some OAT coolants have a longer lifespan than the typical six years. The color is only for cosmetic purposes, so unless you know what’s been used, you can’t tell what’s in it. So unfortunately, this color recognition doesn’t always work. Confusingly, there’s also green-colored coolant, which may be a nitrite-free hybrid liquid that’s used in some classic Jaguars. Pink-colored coolant is for modern engines and, as mentioned, lasts for around six years, but some is for life. It lasts for a couple of years before it should be drained and refreshed. Traditionally, blue-colored coolant is for older engines. Consequently, it’s used in industrial cooling systems around food production. Just like MEG, it’s an organic compound and used in the same way for coolant.
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