Oil change Subaru Outback 2000 - 2006 | Haynes Manuals
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You will need to remove the sump cover / undertray to access the engine sump
Undo the fixings - use a 12 mm socket
Here's the sump plug
Don't forget to place a suitably sized receiving tray beneath
Using a 17mm spanner or socket, carefully remove the sump plug and fully drain the oil.
When the sump has emptied, wipe clean the sump plug area with a paper towel and refit a new sump plug and washer