Non-OAT engine coolant (antifreeze) is introduced into the cooling system in anĮmergency, the cooling system will need to be drained, flushed, and refilled withįresh OAT coolant (conforming to MS.90032), by an authorized dealer as soon as Organic Additive Technology (OAT) engine coolant isĭifferent and should not be mixed with Hybrid Organic Additive Technology (HOAT)Įngine coolant (antifreeze) or any “globally compatible” coolant (antifreeze). Nology (OAT) engine coolant (antifreeze), may result in engine damage and mayĭecrease corrosion protection. Mixing of engine coolant (antifreeze) other than specified Organic Additive Tech.The advice from Valvoline is buy the dealer version if it makes you feel better or buy the Zerex Dexcool for about half the price and get the same antifreeze except for the color. Ronnie finished by saying Valvoline has been getting a ton of phone calls asking what Zerex coolant can be safely used in the 2013 lineup of Chrysler vehicles requiring OAT. Come to find out it's formulation is the same as the latest Dexcool. While Chrysler didn't publicly announce the chemical composition, Valvoline got their hands on this OAT and ran some tests. Another company currently makes the new Mopar OAT. So I asked why is Chrysler stating the only OAT antifreeze to use in the 2013 is theirs and he said money/marketing. Around 2011, the ingredients in Dexcool were revised again.

Ronnie went on to say Valvoline makes the GM Dexcool and around 2006, GM stopped using the 2-EHA. This is why Ford and others shied away from Dexcool when it first appeared back in the early '90s. I debated this point with Ronnie because I had read a SAE article where Chrysler stated their new OAT doesn't have the additive 2-EHA which has been known to soften plastic gaskets and was the cause of so many cooling system and intake manifold gasket issues for GM. This is a common cause of sediment drop out in overflow tanks.Ģ) The Mopar OAT for 2013 and newer (which is expensive as hell from the dealer) is the same as the latest Dexcool. Automakers have been known to throw stuff in the mix to help prolong the life of rubber hoses or lubricate the water pump.

Zerex gets a yellow dye while the Mopar version gets a pinkish dye. Here's what I learned.ġ) Valvoline makes the HOAT for Chrysler. I wondered if the sediment came from the factory HOAT so I placed a call to Valvoline and spoke to one of their antifreeze techs, named Ronnie. I had some leftover Zerex G-05 HOAT antifreeze, which up thru 2012 was the Chrysler specified antifreeze. The other day I noticed some sediment buildup in the bottom of my overflow reservoir. I simply wanted to pass on some info I learned today from a tech at Valvoline. The purpose of this thread isn't to start a debate about anti-freeze.

Poat vs hoat coolant