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mhughett · 07-06-2015, 10:20 PM

I have read that there are basically 3 types of coolant on the market:
1. Inorganic Acid Technology (IAT) which is the "old school" prestone type
2. Organic Acid Technology (OAT) which is the DexCool/VW style
3. Hybrid Organic Acid Technology (HOAT)--this is used by most Asian and European cars, including Subaru

The following was from Popular Mechanics as to whether you can add DexCool to other types of coolant.

Can you mix DEX-COOL™ with other antifreeze products?

Improper mixing of coolants has the potential to cause corrosion issues. Valvoline recommends using the correct antifreeze/coolant for your particular application.

- See more at: http://www.valvoline.com/faq#sthash.soU7pPm6.dpuf

You should never mix DexCool with a HOAT or IAT type coolant.

07-06-2015, 10:20 PM	#3
mhughett Member Join Date: Oct 2014 Drives: 2015 Crystal White BRZ Limited Location: Tulsa Posts: 86 Thanks: 0 Thanked 56 Times in 23 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I have read that there are basically 3 types of coolant on the market: 1. Inorganic Acid Technology (IAT) which is the "old school" prestone type 2. Organic Acid Technology (OAT) which is the DexCool/VW style 3. Hybrid Organic Acid Technology (HOAT)--this is used by most Asian and European cars, including Subaru The following was from Popular Mechanics as to whether you can add DexCool to other types of coolant. Can you mix DEX-COOL™ with other antifreeze products? Improper mixing of coolants has the potential to cause corrosion issues. Valvoline recommends using the correct antifreeze/coolant for your particular application. - See more at: http://www.valvoline.com/faq#sthash.soU7pPm6.dpuf You should never mix DexCool with a HOAT or IAT type coolant.