On vehicle with flexible service interval, the service intervals are calculated, in addition to driven distance and time, also using fuel consumption and oil temperature. This calculation gives a value of the oil's degradation in relation to thermal loading. On vehicles with diesel engines the oil's degradation is calculated based on engine rpm, engine load, driven distance, and oil temperature. This gives values for thermal loading and soot deposits. Oil degradation is the decisive factor for when the next service shall take place.
In some models from model year 2008 and later, not only values for oil change interval are indicated but also values for time and distance-dependent inspection (extra work), e.g., air filter, spark plugs, etc.
When resetting oil service, it is also possible to adapt service interval data to fixed oil change interval or flexible oil change interval by changing value for oil quality. Values that can be selected are shown below:
Oil quality 1 = fixed oil change interval.
Oil quality 2 = flexible oil change interval. Oil of approved standard must be used when adapting to flexible service interval.
When resetting time or distance-dependent inspection (extra work) it is also possible to adapt time and driving distance to next inspection/extra work. See service book for relevant intervals.
Resetting for time and distance-dependent inspection/extra work as well as adaptation for time and driving distance to next inspection/extra work is done in 2 separate functions.
Test conditions:
Ignition on, engine off.
Battery voltage above 12 V.
Procedure:
Select the function.
Follow the instructions shown in the program during the adaptation sequence.
If the function fails, check the test conditions and repair any faults.