Oil and filtersMaintenanceFuel filters and waterMaintenanceCoolantMaintenanceValve lashMaintenanceAir filter and DEFMaintenance
Keep a logbook
Date, mileage or hours, what was done, which fluids and filters. It is the single best thing for resale and for spotting problems early.
When something is wrong
Smoke, hard starts, limp mode or overheating? Our sister site The Diesel Forum troubleshooting library works from the symptom back to the cause.
Where this comes from
- Cummins: Motorhome quick reference guide, B6.7 / ISB (PDF)
- Cummins: Motorhome quick reference guide, L9 / ISL (PDF)
- Cummins: X15 quick reference guide (PDF)
- Ram 2022 2500/3500 owner's manual: engine break-in recommendations (Mopar)
Last reviewed 2026-10-19. General information only: your owner's manual and service information come first.