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what type of coolant does a polaris rzr use

MaintenanceEthan PowellJun 28, 2026, 10:58 AM20 replies

I just picked up a 2023 Polaris RZR XP 1000 and I'm about to do the first coolant flush. I've seen conflicting info online about whether to use OAT or HOAT coolant. The manual says something about a specific type but I want to make sure I don't mess this up. What coolant are you all running in your RZRs? I ride mostly in hot desert conditions if that matters.

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Lily CooperJun 28, 2026, 10:58 AM

I've been using the Polaris extended life coolant in my 2021 RZR Turbo S for two years now. It's pricey but I've had zero issues. Just make sure you get the premixed stuff to avoid distilled water headaches.

Harold MurphyJun 28, 2026, 10:58 AM

Honestly, any quality OAT coolant that's silicate-free should work. I run Zerex G-05 in my 2019 RZR 900 and it's been fine. Just flush the system thoroughly first.

Frank MitchellJun 28, 2026, 10:58 AM

Don't use generic green coolant. I learned that the hard way when my water pump seals started leaking after switching to Prestone. Stick with what the manual says or at least a HOAT compatible fluid.

Beth MitchellJun 28, 2026, 10:58 AM

I'm a mechanic and I see a lot of RZRs with cooling issues from wrong coolant. The Polaris stuff is just rebranded OAT. You can use Peak OET or any OAT that meets ASTM D3306. But check your year—some older models need different specs.

Kevin BrooksJun 28, 2026, 10:58 AM

I run Evans waterless coolant in my 2017 RZR 1000. No pressure, no corrosion, and it runs cooler in the dunes. Expensive but worth it if you ride hard in heat.

Matthew PriceJun 28, 2026, 10:58 AM

Just use the Polaris stuff. It's not that much more and you know it's right. Why risk a $20k machine over a $20 coolant choice?

Chris MurphyJun 28, 2026, 10:58 AM

Actually, I've heard Evans can cause issues with some water pumps because it's thicker. I'd stick with conventional OAT unless you're building a race rig.

Nathan CarterJun 28, 2026, 10:58 AM

I've been using Cat ELC coolant in my 2020 RZR for three years. It's a heavy-duty OAT and cheap at farm stores. No problems so far, but I flush every two years.

Logan GreenJun 28, 2026, 10:58 AM

Make sure you burp the system properly after filling. RZRs are notorious for air pockets. I had to jack the front end up and run it with the cap off to get all the air out.

Rebecca BellJun 28, 2026, 10:58 AM

I disagree with the guy saying any OAT works. Some aftermarket coolants have different additive packages that can react with the aluminum in these engines. I'd stick with Polaris or a known compatible brand like Rotella Ultra ELC.

Andrew MitchellJun 28, 2026, 10:58 AM

I just use distilled water and Water Wetter in my 2015 RZR 800. It's cheap and works fine for trail riding. But I don't ride in freezing temps.

Olivia StewartJun 28, 2026, 10:58 AM

If you're in desert heat, consider adding a coolant additive like Red Line Water Wetter even with the right coolant. It helps with heat transfer. I run it in my 2022 RZR Pro R and it dropped temps by 10 degrees.

Jason MyersJun 28, 2026, 10:58 AM

Check your owner's manual carefully. My 2023 RZR says to use OAT coolant with no silicates. I bought the Polaris stuff from the dealer just to be safe. It's like $25 a gallon.

Ryan EdwardsJun 28, 2026, 10:58 AM

I've had good luck with Valvoline Zerex G-05 in my 2018 RZR 1000. It's a HOAT coolant that's compatible with OAT systems. Just make sure you flush the old stuff completely.

Amy SandersJun 28, 2026, 10:58 AM

Don't forget to check your coolant reservoir level after a few rides. These machines can push air out and you'll lose some. I always carry a spare jug of the same coolant.

Jessica MillerJun 28, 2026, 10:58 AM

I run Engine Ice in my 2016 RZR 900. It's a propylene glycol based coolant that's safer for pets and the environment. Works great in hot weather but it's a bit more expensive.

Steven BryantJun 28, 2026, 10:58 AM

Honestly, I think people overthink this. Any major brand OAT coolant that's compatible with aluminum engines will work. I've used Prestone OAT in my 2020 RZR for 5000 miles with no issues.

Zachary PriceJun 28, 2026, 10:58 AM

Be careful with mixing coolants. If you don't know what's in there now, do a full flush. I mixed two different OATs once and got a gel-like sludge. Had to replace the radiator.

David ColemanJun 28, 2026, 10:58 AM

I'm a dealer tech and we only use Polaris coolant. We've seen too many warranty claims from aftermarket coolants causing seal failures. It's not worth the risk if your machine is still under warranty.

Lucas MitchellJun 28, 2026, 10:58 AM

For desert riding, I'd also recommend upgrading to a high-pressure radiator cap. It raises the boiling point and helps with coolant loss. I run a 1.4 bar cap on my 2021 RZR.

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