Audi R8 LMS 2018 Handbook page 25

The mixture ratio is
For all events in hot countries, Audi Sport customer racing recommends that the
additive ratio is reduced from the ex-works value to the ratio of 10 % additive
and 90 % water. This mixture ratio provides no frost protection.
The cooling system must not be operated without coolant additive.
The additive protects all the components in contact with water from corrosion,
reduces cavitation, lubricates the water pump and increases the cooling fluid's
boiling point.
After reaching operating temperature, the expansion reservoir cap must not be
opened. The system pressure to increase the coolant boiling point would reduce!
Coolant additive mixture ratio:
10 % additive / 90 % water
-
25 % additive / 75 % water
-
40 % additive / 60 % water
-
50 % additive / 50 % water
-
Filling the Cooling System
It is recommended that only distilled water is used to mix with cooling
additives. Using distilled water optimises the corrosion protection.
Only fill the cooling system when the engine is cold.
To fill and bleed the cooling system optimally it is recommended that the filling
device VAS 6096 is used.
100 – Engine Ancillaries, Oil Tank and Water Cooler
35 % coolant additive to 65 % water.
--> no frost protection!
--> frost protection to – 12 °C
--> frost protection to – 25 °C
--> frost protection to – 35 °C
Version 1 2016-01-01
25 / 113