Which specification does Axle & differential oil need for the Audi A6 1.8T (2004–2006)?

Axle & differential oil for the Audi A6 1.8T (2004–2006): 75W-80, 75W-90, VW 501 50, VW G 005 000.

Which specification does Brake fluid need for the Audi A6 1.8T (2004–2006)?

Brake fluid for the Audi A6 1.8T (2004–2006): VW 501 14 (TL 766-Z), FMVSS 116 DOT 3.

Coolant & antifreeze for the Audi A6 1.8T (2004–2006): ASTM D3306, G12.

Power steering fluid for the Audi A6 1.8T (2004–2006): Allison TES 389, Caterpillar TO-2.

For the Audi A6 1.8T (2004–2006), the manufacturer specifies motor oil 0W-30 (VW 506 00, ACEA A5/B5).