Porsche 911 GT3R 2010 Technical Manual page 17

3.5.3. Cooling fluid
3.5.3.1. Capacity
The coolant remains fluid to temperatures of -15°C in delivery
specification.
For all race events Porsche Motorsport recommends that the factory filled
engine coolant is replaced by 24.3 litres of water and 2 litres of anti-
corrosion additive (part number. 997.106.907.90), which protects the
water galleries and other cooling system parts from corrosion, reduces
cavitation, lubricates the water pump and increases the boiling point of
the cooling water. This mixture offers no anti freeze protection.
Approx 26.3 litres
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