Can You Mix Different Types of Coolant?
Most IAT, OAT, and HOAT coolants are not designed to be mixed. Combining incompatible types can form sludge, reduce corrosion protection, and lead to overheating or component damage. The safest approach is to follow your owner’s manual, avoid guessing by color, and flush and refill with the correct coolant when in doubt. This guide helps drivers, workshops, and distributors prevent costly mistakes.