Cummins ISL has the ideal performance for larger, luxury motorhomes. With ratings from 370-425 hp, it has the power to accelerate, at any speed. 1200 lb-ft of peak torque lets you climb steep grades even when towing. The ISL also has a very stout engine brake which provides greater peace of mind on those steep downhill runs. Plus, the engine braking capacity reduces wear on your service brakes, lengthening service intervals and saving you money. And with 20,000-mile (32,000 km) oil change intervals, the ISL makes your maintenance budget go farther.

Performance that’s ground breaking The F4.5 structural engine is designed for small to medium sized tractors (130-160 hp) required to perform a wide variety of tasks such as ploughing, seed drilling, bailing, trailer pulling and front loader work. Complete with a structural block and oil pan, the F4.5 are optimized for minimal weight with maximum strength for engine and driveline durability.