NOTE: Mixing OAT and P-OAT coolants is not recommended. The corrosion protection package in P-OAT (phosphorous, organic acids, yellow metalĪdditives, etc.) provides increased service life and corrosion protection over OAT. Immediate corrosion protection as well as increased service life. The phosphate and stabilizers as well as organic acids in P-OAT provide P-OAT = low Phosphate Organic Acid Technology. OAT coolant has organicĪcids to provide long term corrosion protection. I found this as well that probably lays things out better than I did above.įord Motor Company production of vehicles have changed its current engine coolantįormulation from OAT(ORANGE color) to P-OAT (Yellow color) starting 2018. You are still expected to follow the vehicles change interval though, even though Yellow coolant itself has a life of up to 200K miles. Yellow coolant doesn't require the coolant tests or the VC-12 Coolant revitalizer like orange does, which is what makes it look like a good switch to me. I'm not a chemist, so I won't pretend to understand the significance of the phosphate, but I understand that its good for waterpumps and other corrosion prone components, but reacts harshly with hard water, so distilled water is a must. Long story short as I understand it is that Orange is an OAT coolant (Organic Additive Technology) whereas Yellow is POAT (Phosphated Organic Additive Technology). Just out of curiosity.what are the main differences in the orange and yellow? It would be nice if it already had the additive in it, as well as being easier to test without having to buy expensive test strips or paying the dealer to do so.There's a bit of detail on that in the video, and some in the other document I linked too.
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