Oil change Audi A8 2003 - 2010 | Haynes Manuals
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Here is the sump plug
Do not forget to have a suitably sized receiving tray in place
With an oil catchment tray in position, use a 10mm Allen key to carefully remove the sump plug. Fully drain the oil.
When the sump has emptied, wipe clean the sump plug area with a paper towel
You may need to remove the undertray to access the sump plug. Release the 12 Phillips fixtures and 2 clips. The undertray is heavy and should be correctly supported when removing