Checking the concentration of antifreeze in the coolant — every 10,000 km (Opel Omega A)

1. The concentration of antifreeze in the system should be checked and replaced if necessary. This can be done with a tool similar to a battery hydrometer (see illustration).



2. It is essential that the antifreeze mixture be in the cooling system at all times to protect the engine from corrosion and from freezing in cold weather. The mixture should be made up of clean, soft water (preferably rain) and ethylene glycol-based antifreeze.

3. The ratio of antifreeze to water should be 50/50, then the mixture will not freeze at temperatures down to -30°C.

4. In areas with warm climates, it is necessary to use a fluid with anti-corrosion properties in the cooling system.