BMW X3 Service & Repair Manual: Service recognition

The vehicle recognizes when a service is required using the following three methods:

A. Adaptive, using sensor technology and algorithms to determine the required maintenance of a service item depending upon the individual customer driving style. For example: Oil change is determined from the engine oil condition sensor which monitors the oil condition, oil level, and oil temperature, and from additional algorithms using these parameters: engine load, fuel consumption, time and distance since the last oil change.

Microfilter replacement (dependent on vehicle model and CBS version).

Replacements of front and rear brake pads are determined from 2-stage brake lining wear sensors located on the left front and right rear brake pads, and from residual wear algorithms using these input parameters: travel distance, wheel speed, braking pressure, braking time, and braking frequency.

B. Fixed Time (months) to determine the required maintenance of a service item. For example: Brake Fluid and Engine Coolant changes.
State Safety and Emissions Inspections.

C. Fixed Distance (miles) to determine the required maintenance of a service item. For example: Vehicle Check.

Spark plug replacement (dependent on vehicle model and CBS version)
State Safety and Emissions inspections D. Connected to Oil Service , based on which oil service being performed. For example: Spark plug replacement (dependent on vehicle model and CBS version)
Air filter
Automatic transmission fluid
Microfilter replacement (dependent on vehicle model and CBS version)