The tank was uniquely powered by two different kind of engines, a Rolls-Royce K60 opposed-piston diesel for slow cruising and manoeuvring the tank in aiming, and a Boeing 502 turbine for additional power when travelling at higher speed or in severe terrain; the same layout that later gave the naval configuration called CODAG (COmbined Diesel And Gas), even if many ships had instead the simpler CODOG (COmbined Diesel Or Gas) thanks to the difference between the diesel and turbine power (see, for example, many frigates built for the NATO navies, including the Maestrale and Bremen classes). The turbine was quickly found to be underpowered, and was replaced by a Caterpillar turbine delivering after no more than 70 tanks had been produced, and retrofitted to all previous vehicles. This was the first use of a turbine engine in a production tank; the Soviet T-80 and US M1 Abrams would later be built with gas turbines for main propulsion. The concept was interesting enough that Bofors was asked to build a prototype of the suspension/drive train, which they completed successfully.