OAT coolant stands for Organic Acid Technology coolant, which contains only organic corrosion inhibitors such as carboxylates and triazole
. OAT coolant is a type of long-life or "fill for life" coolant that utilizes additives to significantly increase time between system flushes
. It has slightly reduced anti-corrosive properties compared to Hybrid Organic Acid Technology (HOAT) coolant, which is a derivative of OAT coolant but has more anti-corrosive properties
. It's important not to mix OAT, HOAT, and Inorganic Acid Technology (IAT) coolants as they have different properties and mixing them can greatly reduce lifespan and gunk up your system
. The type of coolant appropriate for your vehicle can be found in your owner's manual
