"SI B12 10 15 Engine Electrical Systems March 2015 Technical Service This Service Information bulletin supersedes SI B12 10 15 dated January 2015. designates changes to this revision SUBJECT N63: CBS Oil Service Conversion in ISTA/P. The CBS oil service conversion performed for the N63 Customer Car Package and timing chain check (SI B11 16 14) did not work correctly with ISTA/P 3.54.x or 3.55.0. It did not change the interval to the desired 12 months/10,000 miles for the vehicles listed above in the specified production ranges. The ""Conversion, oil service 12 months/15,000 km/10,000 miles"" is working properly for all other N63 vehicles produced after these dates. Incorrect coding data in the affected ISTA/P versions"