Titan XD 5.0 V8Owner guideRV and motorhome (ISB / ISL)Owner guideMedium duty and chassis cabOwner guideX15 owner-operatorsOwner guideMarine CumminsOwner guideCrate swaps: R2.8, 4BT, 6BTSwap guide
What every Cummins owner shares
- Your engine's schedule comes from Cummins or the vehicle maker, and often depends on duty cycle.
- Water and dirt in fuel are the enemy of modern injection systems.
- Emissions equipment on road vehicles must stay in place and working.
- Records add value at resale. See buying used.
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)
- Cummins: Marine engine maintenance (PDF)
- U.S. EPA: Tampering and aftermarket defeat device enforcement policy
Last reviewed 2026-10-19. General information only: your owner's manual and service information come first.