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The new Cat CT15 Engine offers Cat CT660 Vocational Truck customers greater horsepower and torque for solid performance in demanding applications. The CT15 joins the CT11 and CT13 as the third engine option for the versatile Cat CT660. The 15-liter engine is available with as much as 550 horsepower and 1,850 lb-ft of torque, which will power the Class 8 truck through heavy-hauling jobs and demanding terrain. The CT15 core is a proven block and crankshaft with billions of miles of operation in demanding truck applications. The dual sequential turbochargers and precisely controlled high-pressure common-rail fuel system enable the CT15 to reach peak torque at 2,100 rpm. The strong pulling power at low engine speeds allows for shifting at lower speeds when accelerating and reduces the need for shifting when powering up steep grades. Interstage cooling between turbochargers increases air density to maintain power as speeds increase. The result is enhanced productivity and less wear and tear on the truck and driver.