![]() hoat has a reduced lifespan because it is mixed with iat, which needs to be changed every two years or. HYBRID OAT (HOAT) HOATs are called hybrids because they combine IAT and OAT technology. it’s designed for up to ten years or 150,000 miles. Diesel engines might require the use of a nitrate-free heavy-duty OAT. however, the oat coolant lasts even longer. you can go five years or 100,000 miles between changes. Do not mix two different types of coolant/ antifreeze. it’s clear that the hoat coolant has an exceptionally long lifetime.While it is okay to switch to a new coolant, here are a few points to keep in mind: Note When You Switch to a New Coolant/ Antifreeze This article will analyze Mopar coolant as equivalents in these two categories. But, are there any equivalent options to Mopar? Mopar is a famous coolant/antifreeze brand used across the board. Surprisingly all local garages keep insisting that the purple (they don't refer to OAT/HOAT) has been replaced by the red one and the only used for Jeeps. However, OAT and HOAT are more popular these days. RoadiJeff said: According to your 2014 GC owner's manual, it uses OAT coolant. It does this by ensuring that the cooling system does not freeze when it is cold and removes excess heat that can cause corrosion.Ĭoolants are classified into three main types: IAT, OAT, and HOAT. I still have some A3 blue left, as I use it for my Honda Odyssey.Coolant, also known as antifreeze, protects your engine from effects of extreme temperature. Is there an advantage to using a newer chemistry coolant (for example the A3, which is recommended for the newer Nissans), and could this possibly extend my service interval if I were to do a complete flush and refill, making sure to fully rid the system of the old stuff? Pentofrost A2 is the appropriate coolant, but what is the difference between the red A1 (pre-2004 Toyota/Lexus/Scion), green A2 (Nissan, Kia, bunch of Japanese makes), blue A3 (Honda, 2009+ Subaru & Nissan) and the pink A4 (2004+ Toyota)? All claim to be a phosphated-OAT (P-HOAT) so the chemistry ought to be similar. UPDATE, CURRENTLY, BOTH BOTTLES NOW USE BLACK CAPS, SO DO NOT RELY ON THIS BEING AN INDICATOR. The third thing you need to know is that the cap on the OAT is black while the cap on the HOAT is blue. That said, my research seems to indicate that Nissan used a green long-life coolant in these years, and recommends a 4 year / 60k mile service. The second thing you'll notice is that the HOAT coolant is rated for 5 years and 100K miles while the OAT is rated at 10 years 150K miles. Can get concentrate shipped to my door for not much more than a couple gallons of diluted stuff from the store. Pentofrost A2 is the appropriate coolant, but what is the difference between the red A1 (pre-2004 Toyota/Lexus/Scion), green A2 (Nissan, Kia, bunch of Japanese makes), blue A3 (Honda, 2009+ Subaru & Nissan) and the pink A4 (2004+ Toyota) All claim to be a phosphated-OAT (P-HOAT) so the chemistry ought to be similar. The Ideal Frequency of Changing Engine Coolant HOAT vs OAT: The Differences. I use Pentofrost antifreeze in all my vehicles- have had good luck with it, and there's a Pentofrost product to fit nearly every application. I'm about to embark on the 250k service for my '96 Nissan Maxima and part of that service will include a coolant flush. ![]()
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