One option is to buy a reset tool and reset the lights.

Another option is the following:

Resetting Oil Service and Inspection Indicator
Connect a wire between pins 7 and 19 on the round diagnostic port near the coolant fill tank on a Z3. Turn the ignition to positon 2 and after about 5 to 7 seconds, pull out the wire and the Oil Service and Inspection indicator will be reset

No need for reset tool