3/30/2023 0 Comments Hoat coolant![]() Minivans and SUVs with rear heater circuits can trap even more residual coolant in their veins. The other third remains trapped in the engine block, heater core and heater hoses. But if it tests marginal or bad, it needs to be changed regardless of how long or how many miles it has been in service.ĭraining the radiator to change the coolant only removes about two-thirds of the total coolant in the system. If the coolant tests good, it still has some time and mileage to go. Chemical test strips can be used to check the “reserve alkalinity” (a measure of corrosion protection) of the coolant. This includes vehicles used by Uber and Lyft drivers, long-distance commuters, traveling salespeople, delivery vehicles, etc.Īlthough the recommended service interval is five years or 150,000 miles for long-life coolants, does that mean the antifreeze is worn out and needs to be changed when the time or mileage limit is reached? It may, depending on the condition of the corrosion inhibitors that are still active in the coolant. ![]() The only exception would be vehicles that rack up more than 150,000 miles in less than five years. So, for most applications, five years is the recommended service interval for changing the coolant. What’s important to note is that the coolant manufacturers mean whichever comes first, not last! For normal driving of 12,000 to 15,000 miles per year, five years will pass long before the odometer hits 150,000 miles. Most of today’s factory-fill coolants have OAT (Organic Acid Technology) or HOAT (Hybrid Organic Acid Technology) corrosion inhibitors with a service life of five years or 150,000 miles. Long-life antifreeze is not forever antifreeze.
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