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Originally Posted by DJRobbGordon
From BMW TSB B12 25 05
CBS4 was first introduced with the E90 and it differs from the previous CBS2 and CBS3 systems in regards to how the "Engine Oil Service" is calculated.
The CBS4 starting point, of 25,000 km or 15,534 miles for engine oil, is initiated during the PDI - QC1 Handover Inspection with the entry of the "Date of Registration" or after a CBS reset. The Instrument Cluster will round up this data value sent from the DME and begin with a display of 16,000 miles. The countdown until "Service Due" for engine oil is based primarily on the fuel consumption value as calculated by the DME.
The CBS4 algorithm in the DME uses the following fuel consumption averages to achieve the 15,534 target oil service mileage.
N52 with automatic transmission = 21.4 mpg
N52 with manual transmission = 21.7 mpg
Actual fuel consumption above or below these averages may increase or decrease the target service mileage accordingly.
The displayed mileage until service is due, beginning at 16,000 miles, will decrease in 1000 mile increments until approximately 5000 miles remain. It then decreases in 100 mile increments until 500 miles remain, and finally in 10 mile increments until due.
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Very good info. The only question I have is my on board computer showed
18000mi to next oil service when new (10/9/2005), it showed 16000mi at the 3000mi . Is the CBS4 on my vehicle defective?