17 11 509 Flushing radiator: Notes
WARNING: This page is about a different car, the 2002 BMW Z3 and 2001 BMW Z3. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
If oil has penetrated the coolant circuit, you must flush the radiator and coolant expansion tank with cleaning agent.
CAUTION:
When working on the oil, coolant or fuel circuit, protect the alternator against contamination (not applicable to alternators with coolant jackets). Cover alternator with suitable materials. Failure to comply with this procedure may result in an alternator malfunction.