ISL for Fire & Emergency (EPA 07)


ISL for Fire & Emergency (EPA 07)The two things that matter most in a fire or emergency vehicle are response time and reliability. So we built the 2007 ISL with superior performance and exceptional dependability. And in the process, we also made it run cleaner.

How did we make these improvements and still meet stringent emissions controls? The ISL is designed as a totally integrated system that includes our proven cooled-EGR subsystem, a High Pressure Common Rail fuel injection system, patented VG Turbo, Cummins Particulate Filter and a crankcase ventilation system. Add the optional compression brake, and it even stops better with more than 330 braking hp.

And that's just the start of all the features the ISL has to help your fire and emergency vehicles get ready to roll on a moment's notice, every time.

The ISL is also designed to keep your budget from going up in smoke, with long maintenance intervals and excellent fuel economy. Ratings range from 345-425 hp.


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, Fire & Emergency

See ISL PowerSpec Engine Features


The superior performance of the ISL comes from a constant flow of high-pressure fuel, injected with precise timing for optimum burn efficiency. An increased number of injection events per cycle results in an ISL that runs stronger and more efficiently than ever before.

Advertised Horsepower 345-425 hp 257-317 kW
Peak Torque 1150-1250 lb-ft 1559-1695 N•m
Governed Speed 2100-2200 rpm
Clutch Engagement Torque 550 lb-ft 746 N•m
Number of Cylinders 6
Oil System Capacity 7.3 U.S. gallons 27.6 liters
System Weight 1,760 lb 798 kg
Engine (Dry) 1,678 lb 761 kg
Aftertreatment* 50 lb 22 kg

*Increase over standard muffler


Product Finder Specifications

Certification Level EPA 2007
Power 345 - 425 hp / 257 - 317 kW
Torque 1150 - 1200 lb-ft / 1559 - 1627 N•m


Engine Model Advertised hp Peak Torque Governed Speed
ISL 425 425 1200 @ 1300 2200
ISL 400 400 1200 @ 1300 2200
ISL 370 370 1200 @ 1300 2200
ISL 365 365 1250 @ 1400 2100
ISL 345 345 1150 @ 1400 2100


  • Enhanced High Pressure Common Rail Fuel System - Delivers optimum balance of performance, emissions control and fuel economy across the entire operating range.
  • Full-Authority Electronic Controls - Higher microprocessor capacity and speed for optimum control of the engine and aftertreatment.
  • Cooled Exhaust Gas Recirculation - Lowers combustion temperatures for reduced emissions and optimized mpg.
  • Variable Geometry Turbocharger - Enhanced response and control with electric actuation for infinite adjustment, providing exact boost across the operating range. Sliding-nozzle design increases reliability, durability.
  • Cummins Particulate Filter - Fully integrated for uncompromising performance, reliability. Reduces particulate matter 90%.
  • Crankcase Ventilation System - coalescing filter only needs replacement every 3rd to 4th oil change.
  • Low Maintenance - Long oil change intervals maintained. Cummins Particulate Filter will go 200,000-400,000 miles (320,000-640,000 km) in a typical duty cycle for most vehicles before it needs cleaning.
  • Heavy-Duty Features - Replaceable wet liners, roller followers, two-piece steel articulated pistons, by-pass oil filtration, and targeted piston cooling.


Maintenance Intervals
  MilesKilometers Hours Months
Oil and Filter 20,000 mi / 32,000 km 500 6
Primary Fuel Filter 20,000 mi / 32,000 km 500 6
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 240,000 mi / 385,000 km N/A 24
Coalescing Filter Every 3rd to 4th Oil Change
Particulate Filter 200,000-400,000 mi (320,000-640,000 km)

*If engine is equipped with an optional coolant filter, it will need to be replaced on the same intervals as the oil filter.

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

Brochures Available

Title Bulletin Number Request View  
Cummins Particulate Filter For Fire And Emergency Vehicles Flyer (EPA 2007 and EPA 2010) 4971356 Request View  Download
National Overhaul Warranty For MidRange Engines Flyer 4021552 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