Oil change Citroen C3 2002 - 2009 | Haynes Manuals
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The sump plug is located on the base of the engine. It is accessed underneath the car
You will need to remove the undertray
Undo the fixings. Carefully remove the undertray
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. Reinstate the undertray