ISX12 For Motorcoach (2017)


ISX12 For Motorcoach (2017)Providing the Motor Coach market with a dependable heavy-duty platform, developed from a fully integrated and stable engine architecture and system design, the ISX12 provides motor coach entities with the benefit of low change. Available throughout 2018, the Buy America-compliant ISX12 will continue to use the established Cummins Aftertreatment System offering proven reliability and durability.


Governed Speed 2100 RPM
Clutch Engagement Torque 800 LB-FT 1085 N•M
Number of Cylinders 6
Engine Weight (Dry) 2,640 LBS 1,197 KG

Product Finder Specifications



Engine Model Advertised HP (kW) Peak Torque LB-FT (N•M) @ RPM 
ISX12 425 425 (317) 1650 (2237) @ 1100
ISX12 425 425 (317) 1450 (1966) @ 1100
ISX12 385 385 (287) 1450 (1966) @ 1100


Cummins designs, develops and supports every component, from the air handling to the exhaust aftertreatment, to work as a totally integrated system – so we can optimize every function better than other engine manufacturers

  • VGT™ Turbocharger from Cummins Turbo Technologies – The patented design is widely recognized as the industry leader for performance. Electric actuation improves precision and responsiveness. The VGT Turbocharger also increases fuel economy and braking horsepower.
  • XPI Fuel System From Cummins Fuel Systems – Delivers superior performance regardless of engine rpm. Multiple injection events per cycle improve fuel efficiency and enable smoother, quieter operation.
  • Cummins Aftertreatment System from Cummins Emission Solutions – Proprietary system consists of a Diesel Particulate Filter (DPF) and Selective Catalytic Reduction (SCR) technology for near-zero emissions.
  • Fleetguard® Fuel Filters, Lube Filters and DEF from Cummins Filtration – Fleetguard filters protect against corrosion and contaminants that can cause performance issues. High quality DEF is widely available at authorized Cummins and Fleetguard locations, as well as in bulk delivery.
  • Single High-Capacity Electronic Control Module (ECM) – A single ECM manages the engine and aftertreatment system for optimum performance and fuel efficiency.


Duty Cycles* Light Normal Severe
Oil & Filter 15,000 MI
24,000 KM
25,000 MI
40,000 KM
35,000 MI
56,000 KM
Fuel Filter 30,000 MI
48,000 KM
30,000 MI
48,000 KM
35,000 MI
56,000 KM
Coolant Filter**   50,000 MI
80,000 KM
Valve Adjustment   250,000 MI
400,000 KM
Coalescing Filter   150,000 MI
240,000 KM
DEF Filter   300,000 MI
480,000 KM
Particulate Filter Cleaning   200,000 MI
320,000 KM
*Light Duty > 7mpg; Normal Duty = 7-6 mpg: Sever Duty < 6 mpg
**With appropriate filter
For complete maintenance information, please consult your Owners's Manual or Operations and Maintenance Manual, available on Cummins Quickserve Online

Brochures Available

Title Bulletin Number Request View  
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