engine oil AUDI A8 1999 D2 / 1.G AHA ATQ Engines Cooling System Components Workshop Manual

19-12


Filling
Notes: - Drain engine coolant at drain plug (arrow).
Only use coolant additive G12 (according to TL VW 7745 D). G12 is
red in color. Do not mix G12 with any other coolant additive!If the fluid in expansion tank is brown, G12 has been mixed with other
coolant. In this case, the coolant must flushed and replaced. "G12" and coolant additives marked in accordance with "TL VW 774
D" prevent frost and corrosion damage, scaling and also raise the
boiling point of the coolant. Therefore, the cooling system must be
filled year round with frost and corrosion protection additives. A higher boiling point improves engine reliability under heavy load
particularly in countries with tropical climates. Frost protection additives protect against frost to about -25 C (about -
35 C in arctic climates). The coolant concentration must not be reduced by adding water even
in warmer seasons and in warmer countries. The anti-freeze ratio
must be at least 40%.
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