2008 BMW X5
Customer complaint: engine stalling. Car was brought to the local dealer, stayed for two weeks and they found nothing wrong.
Repairs done: Upon a thorough diagnostic, codes were present. Oil was leaking badly under the car. Four (out of 6) important bolts were missing. Oil cooler gasket was replaced, alternator was not charging properly and had to be replaced, water pump, thermostat were replaced as part or the maintenance.