You may need to remove the undertray to access the sump plug
Undo the fixings - use a 10mm socket. Caution – the undertray is heavy
Don't forget to have a suitably sized receiving tray in place
Use an 8mm SQUARE socket to 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 the sump plug and washer. Do not over tighten. Replace the undertray