– Bigger Power for Bigger Motorhomes. The ISL is the fastest growing engine in the motorhome market, with exceptional performance and sophisticated electronics. With power up to 450 hp and 1250 lb-ft of torque, the ISL9 can accelerate at any speed and quickly climb the steepest grades even when towing. The ISL offers a very strong engine brake for extra braking capacity and added driver control. With 20,000 mile (32,000 km) oil change intervals, the ISL saves money and time when it comes to maintenance. If you're looking to power a premium motorhome, the ISL rules the road.
– Running Clean Into the Future. Cummins ISB delivers superior performance with the lowest cost of operation and maximum uptime to make it best-in-class. Its High Pressure Common Rail (HPCR) fuel system delivers an optimum balance of performance, emissions control and fuel economy. No other diesel comes close to matching the value of the ISB.