Oil change Citroen C4 2004 - 2010 | Haynes Manuals
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The sump plug is located on the base of the engine. You will need to remove the sump cover
Undo the fixings - use a screwdriver
Here's the sump plug
Don't forget to place a suitably sized receiving tray beneath
Using a 21mm 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 fit a new sump plug and washer
Do not over tighten