Cummins Engine Co.'s ISL engine is the latest member of the Interact System family. Customers led a team of Cummins engineering, manufacturing, and marketing specialists to a systems approach. Integrated electronics optimize fuel, lube, cooling, air, and powertrain performance while tracking vital statistics for the driver, technician, and/or fleet manager. This four-valves-per-cylinder engine features heavy-duty components such as articulated pistons with targeted piston cooling.