Engine Controls - Engine Oil Service with CBS4

SI M 12 08 07
Engine Electrical Systems

December 2007
Technical Service

SUBJECT
N12 and N14 Engine Oil Service with CBS4

MODEL
All R56 Cooper and Cooper S from 12/06

INFORMATION
With the introduction of the R56 and the N12 and N14 engines comes the CBS4 strategy of Conditioned Based Service. Maintenance requirements for the engine oil are now calculated in the DME (maintenance requirements = the remaining distance and latest date for the engine oil change).

The DME calculation of the forecasted mileage interval is based upon an actual fuel consumption variable. The CBS oil service can also come due in 24 months, after the last CBS reset, if the total fuel consumption value has not been reached. However, it is recommended in the US market to change the engine oil at least once a year. More details concerning the low mileage annual oil service may be found in SI M01 02 03.

A nominal starting point of 24135 km (approximately 15000 miles) can variably increase or decrease based upon the actual learned fuel consumption when compared to the set average values of the DME dataset.

It is the total fuel consumption, and not the accumulated mileage, which influences when the oil service will be due.

The displayed mileage until due is only a forecast, and will decrease at a quicker rate once the remaining percentage drops below 50%.
After each oil service and CBS reset, this learned or adapted fuel consumption profile is used to recalculate a new starting point until the next oil service.

Actual fuel consumption values, which differ from the set averages, will effectively influence the displayed forecasted mileage remaining until the next service.





The table lists the average values currently used in the DME algorithm.

WARRANTY
Information only