Correct answer
With the product, dilution and fill level specified by the manufacturer.
Identify the correct reservoir and use the product and amount specified by the manufacturer, with antifreeze protection suitable for temperature. Follow its safety instructions for filling. If concentrated, prepare the specified dilution; do not independently dilute a ready-to-use product. Do not add engine coolant or brake fluid. A universal rule to always fill to maximum or prohibit any water must not override product and vehicle instructions.
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By adding engine coolant to prevent freezing.
By always filling it until it overflows to prevent overpressure.
With the product, dilution and fill level specified by the manufacturer.
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