The sump plug is located on the base of the engine. It is accessed underneath the car
You may need to remove the sump cover - use a 10mm socket
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
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