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Front Final Drive Fluid <--> [Differential Fluid - A/T] > < Audi S4 Quattro Wagon V8-4.2L (BHF) (2008)|Capacity Specifications
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Coolant: Fluid Type Specifications

Coolant System

Type ........................................................................................................................................................................... Phosphate-free coolant G 012 A8F A4
Color .................................................................................................................................................................................................... lilac or violet (purple)
Specification ...................................................................................................................................................................................................... TL VW 774F

Use phosphate-free coolant G 012 A8F A4 G12+ (purple), Valvoline G12 (purple) is really G12+.
Note the following mixing combinations:
G11 (green) & G12 (pink): NO
G11 & Valvoline G12: OK
G11 & G12+: OK
G12 & Valvoline G12: OK
G11 & G12 & G12+: NO
G11 & G12 & Valvoline G12: NO

Frost protection is required down to approx. -25°C (-13°F). In countries with arctic climates, frost protection is required down to approx. -35°C (-31°F). 
The anti-freeze ratio must be a minimum of 40%, otherwise frost protection is reduced. 
The recommended mixture ratio is 50:50. If greater frost protection is required (very cold climates), the amount of G 012 A8F A4 can be increased, but
only up to 60%. 
This provides frost protection to approx. -40°C (-40°F).
Do not reduce the coolant concentration by adding water, even in warmer seasons/countries, as cooling effectiveness will be reduced.

Front Final Drive Fluid <--> [Differential Fluid - A/T] > < Audi S4 Quattro Wagon V8-4.2L (BHF) (2008)|Capacity Specifications