Checking gear oil level in gearbox and topping up: Audi A6 C6

🧭 Before you start

Fits: Audi A6 C6 (4F, 2004–2011)

• Opens: gearbox oil
• Renewed: oil filler/inspection plugs

Don't miss

• Gearbox support must be removed in order to access oil filler/inspection plug for transfer box.
• Gearbox must be in horizontal installation position when checking gear oil.It must be raised or lowered accordingly using engine and gearbox jackV.A.G 1383 A after removing tunnel cross member.
• Observe relevant disposal regulations.
• Oil filler/inspection plug for transfer box is located on side of transfer box housing and is inserted from below (arrow).Illustration shows sectional view of transfer box from rear side with gear oil level and filler opening.
• It is important to wait for 5 minutes so that the internal oil level in the system has time to equalise.

📋 Procedure

1. Remove gearbox mounting and gearbox support [Note: Gearbox support must be removed in order to access oil filler/inspection plug for transfer box.]
2. ⚠ When performing the steps below, please note the following:Do not support the gearbox under the oil pan - risk of damage. — Insert a bolt M12x100 (item 1) with attached nut (2) into the mounting hole behind the oil pan on the gearbox.
3. Apply lifting column of engine and gearbox jackV.A.G 1383 A to bolt head and raise gearbox until it is in horizontal installation position again. [Note: Gearbox must be in horizontal installation position when checking gear oil.It must be raised or lowered accordingly using engine and gearbox jackV.A.G 1383 A after removing tunnel cross member.]
4. Place used oil collection and extraction unitV.A.G 1782 below gearbox. [Note: Observe relevant disposal regulations.]
5. ⚠ Wear safety goggles. — Remove oil filler/inspection plug (arrow) for transfer box. [Note: Oil filler/inspection plug for transfer box is located on side of transfer box housing and is inserted from below (arrow).Illustration shows sectional view of transfer box from rear side with gear oil level and filler opening.]

6. Remove oil filler/inspection plug (arrow) for front final drive.
7. Using hand pump for gear oilVAS 6617, slowly fill front final drive until gear oil emerges at bottom lip of oil filler hole (arrow).
8. Wait for 5 minutes and repeat procedure. [Note: It is important to wait for 5 minutes so that the internal oil level in the system has time to equalise.]
9. Using hand pump for gear oilVAS 6617, fill gear oil slowly into transfer box housing through oil filler hole on transfer box (arrow) until oil comes out at filler hole.
10. Wait for 5 minutes and repeat procedure. [Note: It is important to wait for 5 minutes so that the internal oil level in the system has time to equalise.]
11. Top up gear oil again until oil level is correct.
12. Allow excess gear oil to drain out of opening until oil level in transfer box is correct. [Note: The level does not need to be re-checked after this step.]
13. Always renew oil filler/inspection plugs.
14. Install gearbox support, gearbox mounting and tunnel cross member .
15. Assemble exhaust system so it is free of stress 26.

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