Oil change Mini One 2001 - 2006 | Haynes Manuals
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You will need to remove car's undertray to access the engine sump
Use a Phillips screwdriver and an 8mm socket - carefully remove the undertray
Here's the sump plug
Don't forget to place a suitably sized receiving tray beneath
Using a 14mm 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. Now change the oil filter before replacing the undertray