ISL9 for Medium-Duty Truck (EPA 2010)


ISL9 for Medium-Duty Truck (EPA 2010)Expect the same high level of performance, reliability and fuel economy with the Cummins ISL9 EPA 2010 engine as you do with today’s ISL.  The ISL9 has one of the highest power-to-weight ratios in its class with heavy-duty features like replaceable wet liners.  It also features the XPI fuel system – the same technology that’s used in the ISX15.  These advances combined with an improved Electronic Control Module (ECM) and improved air flow, allow the ISL9 to run stronger and with greater responsiveness than ever before.   Ratings range from 345-380 hp with a maximum 1300 lb-ft of torque.

How did we make these improvements and still meet stringent 2010 emissions standards?  With a totally integrated system, that’s how.  Everything from the advanced fuel injection technology, improved cooled EGR subsystem and Cummins VGT™ Turbocharger to the proven Cummins Aftertreatment System that includes Selective Catalytic Reduction (SCR) technology has been engineered and manufactured in-house.  The result is a totally integrated system delivering an engine that provides near-zero emissions without compromising performance.
And that’s just a few of the features the ISL9 has to offer to help both your vehicles, and your business, run smoother.  These engines are designed to keep your maintenance to a minimum and your productivity in overdrive.

All backed by the best customer support in the business.

Considering a Cummins engine purchase? For more information including pricing and additional technical information, please contact your Cummins representative. If you need help finding a representative, the Cummins Sales and Service Locator tool can help.


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, Medium-Duty Truck

See ISL PowerSpec Engine Features


Advertised Horsepower  345-380 hp  257-283 kW 
Peak Torque  1150-1300 lb-ft  1560-1763 N•m
Governed Speed 2100 rpm
Clutch Engagement Torque 575 lb-ft  780 N•m
Number of Cylinders
Oil System Capacity 7.3 U.S. gallons  27.6 liters 
System Weight  1,850 lb  839 kg 
     Engine (Dry)  1,650 lb  749 kg 
     Aftertreatment System*  200 lb  90 kg 
*Increase over standard muffler and does not include chassis OEM-supplied components

Engine Finder Specifications

Certification Level EPA 2010
Power 345 - 380 hp / 257 - 283 kW
Torque 1150 - 1300 lb-ft / 1559 - 1763 N•m


Engine Model  Advertised Horsepower (kW)  Peak Torque lb-ft (N•m) @ rpm 
ISL9 380  380 (283)   1300 (1763) @ 1400 
ISL9 370  370 (276)  1250 (1695) @ 1400 
ISL9 345  345 (257)  1150 (1559) @ 1400 


XPI Fuel System - Delivers a precise quantity of fuel at ultra-high pressures.  This, together with more robust electronic engine controls, enables multiple injection events per cycle.

Heavy Duty Design - Rugged features include replaceable wet liners, roller followers, by-pass oil filtration and targeted piston cooling for longer service in the toughest work environments.

VGT™ Turbocharger - Enhanced response and control with electric actuation for infinite adjustment, providing exact boost at any rpm. Sliding-nozzle design increases reliability and durability.

Cooled EGR - Next-generation system lowers combustion temperatures for reduced emissions and optimized fuel economy.

Fully Integrated Electronic Controls - A single, higher-capacity Electronic Control Module (ECM) controls everything from air intake to exhaust aftertreatment for peak performance and near-zero emissions.

Cummins Aftertreatment System - The proven Cummins Particulate Filter reduces particulate matter by over 90%. In 2010 it is combined with Cummins Selective Catalytic Reduction (SCR) to meet emission standards while maintaining best-in-class performance, reliability and durability.


Maintenance Item  Miles / Kilometers  Hours  Months 
Oil and Filter* 20,000 mi
32,000 km 
Primary Fuel Filter**  20,000 mi
32,000 km
Secondary Fuel Filter  40,000 mi
64,000 km 
1,000  12 
Coolant Filter  None***  None***  None***  
Overhead Adjustment 150,000 mi
241,500 km 
5,000  48 
Standard Coolant Change  80,000 mi
128,000 km 
2,000  24 
Coalescing Filter 

Every 3rd to 4th Oil Change Interval

DEF Filter

  200,000 mi (320,000 km)

Particulate Filter

 200,000 - 400,000 mi (320,000 - 640,000 km)

*Assuming normal duty cycle.
**OEM supplied, intervals may vary.
***If engine is equipped with an optional coolant filter, it will need to be replaced on the same intervals as the oil filter.  Regardless if the engine is or is not equipped with a coolant filter, SCA/DCA additive levels must be checked according to the interval listed in the Owner's Manual.
****Extended coolant and drain/fill/flush intervals may be followed when certain requirements are met.  For more information on these requirements, refer to the Cummins Coolant Requirements and Maintenance Service Bulletin 3666132.

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