12 13 Carrying out engine cleaning (N54)
WARNING: This page is about a different car, the 2016 BMW Z4, 2015 BMW Z4, and 2014 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
When cleaning the engine, it is absolutely essential to keep the ignition coil covers fitted in order to protect the injectors.