Oil change Audi A6 2004 - 2009 | Haynes Manuals
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You will need to remove the undertray to access the sump
Undo the undertray fixings
Carefully remove the undertray
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 19mm spanner or socket 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
Replace (new) sump plug and washer. Do not over tighten. Replace the undertray