TSIB 20-01
Service Bulletin/Repair Instructions
Technical Service Information Bulletin describing changes to the Cummins ISLG, L9N, ISB6.7G and B6.7N engine oil specifications.
Vehicle report
Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
TSIB 20-01
Technical Service Information Bulletin describing changes to the Cummins ISLG, L9N, ISB6.7G and B6.7N engine oil specifications.
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.