ISX for Motorhome (EPA 07)


ISX for Motorhome (EPA 07)For superior performance, exceptional fuel efficiency and incredibly strong braking power, ultra-luxury motorhome owners choose Cummins ISX. Every time.

With ratings from 525-600 horsepower, the ISX delivers uncompromising performance for towing heavy loads and climbing steep mountain grades. Standard features include the patented Variable Geometry Turbocharger (VG Turbo), now with electric actuation for enhanced engine response at every rpm. While the standard Intebrake system produces over 600 braking horsepower for superior driver control on downhill slopes.

Plus, the ISX is certified and compliant to the toughest standards -- the 2007 EPA emission regulations. A Cummins-designed and built particulate filter reduces particulate matter by over 90%, and a crankcase ventilation system virtually eliminates oil carryover. Best of all, there's very little maintenance to these components, along with the rest of the engine.

Ask any owner, and they'll tell you that ISX reliability is second to none. Every ISX is backed by the most extensive customer support network in the industry, with programs like Coach Care™ to meet your service needs as you travel across North America in your motorhome.

For Cummins-branded merchandise, electronic tools, literature and more, visit our PowerStore web site.


Cummins PowerSpec is an electronic tool that makes it possible to tailor the operation of Cummins engines in every on-highway application.

Available for: On-Highway, Recreational Vehicle, Motorhome Engines

See ISX PowerSpec Engine Features


Advertised Horsepower 525-600 hp 392-447 kW
Peak Torque 1450-1850 lb-ft 1966-2508 N•m
Governed Speed 2000-2100 rpm
Clutch Engagement Torque 1000 lb-ft 1356 N•m
Number of Cylinders 6
Oil System Capacity 14 U.S. gallons 52.9 liters
System Weight 3,093 lb 1,403 kg
   Engine Weight (Dry) 3,021 lb 1,370 kg
   Aftertreatment* 72 lb 33 kg

*Increase over today's muffler.

Product Finder Specifications

Certification Level EPA 2007
Power 525 - 650 hp / 391 - 485 kW
Torque 1650 - 1950 lb-ft / 2237 - 2644 N•m


Engine Model Advertised hp (kW) Peak Torque lb-ft (N•m) @ rpm Governed Speed
ISX 650 650 (485) 1950 (2644) @ 1300 2100
ISX 600 600 (447) 1850 (2508) @ 1400 2100
ISX 525 525 (392) 1650 (2237) @ 1400 2000


  MilesKilometers Months
Oil and Filter 15,000 mi
24,000 km
Fuel Filter* 25,000 mi
40,000 km
Coolant Filter 50,000 mi
80,000 km
Overhead Adjustment 500,000 mi
800,000 km
Coalescing Filter 125,000 mi
200,000 km
Particulate Filter Cleaning 200,000-400,000 mi
320,000-640,000 km

*Oil, fuel and water filters should be changed at every oil change.

See your Owner's Manual for every detail. And when it's time for maintenance, be sure to visit your authorized Cummins distributor or dealer.

Cummins ISX is fully compatible with long-life coolant/antifreeze formulas which allow changes out to 6 years. Follow maintenance guidelines recommended by the manufacturer for safe use with extended service intervals.

For complete maintenance information, please consult your Owner's Manual or Operations and Maintenance Manual.

Brochures Available

Title Bulletin Number Request View  
New Cummins ISX '07 Diesel Particulate Filter Flyer 5410625 Request View  Download
New Cummins ISX '07 Diesel Particulate Filter Flyer - French 5410634 Request View  Download
New Cummins ISX '07 Diesel Particulate Filter Flyer - Spanish 5410635 Request View  Download
NRP - DPF There Is A Difference Brochure 5410774 Request View  Download
NRP - DPF There Is A Difference Brochure (French) 5410815 Request View  Download
NRP - DPF There Is A Difference Brochure (Spanish) 5410816 Request View  Download