Caution: Use only special TOYOTA fluids or ethylene glycol-based coolants with anti-corrosion properties. The coolant must be compatible with the aluminum components of the cooling system. Alcohol-based coolant must not be used.
Anti-corrosion additives in the coolant lose their effect over time. As a result, the coolant must be changed as part of the maintenance, see section "Maintenance". The coolant must also be changed if aluminum parts of the engine that are in contact with the coolant are replaced, for example after a cylinder head has been replaced.
The ratio of the individual components of the coolant recommended by the manufacturer must be strictly adhered to. Antifreeze protects the cooling system in the German latitudes down to -30°C.
Caution: Use mineral-free water or distilled water as the coolant water.