OAT Coolant (Organic Acid Technology)
OAT coolant is a long-life coolant that uses organic acids instead of silicates and phosphates to protect against corrosion.
What is OAT Coolant (Organic Acid Technology)?
Hybrid types such as HOAT and Si-OAT mix technologies. Change intervals are often long. Colour is not a reliable guide to the type. Coolant should also be changed when its anti-freeze protection drops, which can be checked with a refractometer.
How it works
Organic acids protect metal surfaces only where corrosion begins, so they last longer.
Why it matters for your car
Mixing incompatible coolants can form sludge or reduce protection. Use the type specified by the manufacturer.
Other terms
- Air Filter
- All-season Tyre
- Brake Warning Light
- Cooling System Bleeding
- DPF Regeneration
- Engine Stalling
- Fuel Filler Neck
- Fuel Filter
- Insulation Monitoring (Isolation Fault)
- Plug & Charge (ISO 15118)
- Radiator Stop Leak
- Saloon (Sedan)
- Timing Chain
- Torque Curve
- Track Day
- Traction Control (TCS)
- Transmission Range Sensor (Gear Selector Switch)
- Water Spots
- Windscreen (Windshield)
- Zipper Merge