The sump plug is located on the base of the engine. It is accessed underneath the car
You will need to remove the sump cover - use a Phillips screwdriver
Do not forget to have a suitably sized receiving tray in place!
With an oil catchment tray in position, use a 17mm spanner or socket to carefully remove the sump plug. Fully drain the oil.
When the sump has emptied, wipe clean the sump plug area with a paper towel
Replace (new) sump plug and washer. Do not over tighten
Find a Haynes product for your BMW:
Search by registration mark
Search by make & model