X15 For Motorhomes (2017)

Power 565 - 605 hp
421 - 451 kW
Torque 1850 - 1950 lb-ft
2508 - 2644 N•m
Certification EPA 2017

Select an Application

Overview Motorhome and RV Engines Marine

Available Regions

US and Canada,  Russia,  Argentina,  Mexico,  Philippines,  Singapore,  Bolivia,  Brazil,  Uruguay,  Paraguay,  Argentina,  Colombia,  Central America,  Europe,  Korea,  Japan


How do you make the industry-leading 15-liter engine even better? You talk to customers, spend thousands of hours on a dynamometer and run 9 million real-world test miles to deliver better performance, reliability and support.


  • Optimized Emissions Control – Cummins Single Module™ aftertreatment has exceptional thermal efficiency, resulting in fewer regenerations.
  • Hardware Improvements – Includes a stronger turbo actuator, a larger-flow Exhaust Gas Recirculation (EGR) cooler and optimization through removal of several components.
  • Improved Oil Control – Up to 40 percent reduction in oil consumption through power cylinder improvements.
  • Collaboration with Chassis Builders – Each installation undergoes rigorous testing to ensure trouble-free operation.


  • The Most Powerful Engine for Motorhomes – The X15, with up to 605 hp, now has better performance at lower rpm, for faster acceleration and more confidence when driving in the mountains.
  • Stay in Control – The most powerful compression brake in the industry, with over 600 bhp, for confidence going down grades and better service brake life.
  • Better Acceleration, Faster Warm-Up and Stronger Engine Braking – The proven Cummins VGT® Turbo incorporates 15 years of technological improvements.
Configuration Inline 6
Displacement 912 CU IN 14.9 L
Lube Oil Capacity 44 QT 41.6 L
Biodiesel Compatibility Up to B20
Engine Braking Horsepower Up to 600 HP @ 2100 RPM
Idle Speed 600-800 RPM
No Load Governed Speed 2130 RPM
Engine Weight (Dry) 2,964 LB 1,344 KG
Aftertreatment Weight* 173-211 LB 78-96 KG
Injection Pressure 32,000 PSI

*Depending on configuration

Engine Model Advertised HP (kW) @ RPM Peak Torque LB-FT (N•M) @ RPM
X15 605 605 (451) @ 1800 1950 (2644) @ 1150
X15 565 565 (421) @ 1800 1850 (2644) @ 1150


  • Cummins on Every™ Corner – Over 3,500 authorized locations across North America, to support parts and service needs.
  • One Source for Service – Your local distributor supports both Cummins engines and Cummins Onan® generators.
  • Connected Solutions™ – Combine with Cummins QuickServe® Online mobile, Cummins Fault Advisor and Connected Diagnostics,™ for even better support.
  • INSITE™ Mobile – Enables downloading of critical engine and operational data to mobile devices for fast, accurate diagnostics and reporting.
  • Easier Maintenance – New crankcase ventilation design requires no maintenance. A single oil-drain plug makes oil changes faster and easier.
  • Get the Latest – For more information on the Cummins X15 engine and Cummins Onan generators, visit rv.cummins.com. For maintenance and parts information, visit quickserve.cummins.com
Maintenance Item Miles/Kilometers Hours Months
Oil and Filter 15,000 MI
24,000 KM
500 12
Fuel Filter 15,000 MI
24,000 KM
500 6
Overhead Adjustment 150,000 MI
240,000 KM
5,000 48

Consult your chassis and engine Owners Manuals for more information

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