The pistons face away from each other in a 180 degree symmetrical layout and work to balance out each other’s vibrations, delivering a smooth, shudder-free feel. The length and height of this engine layout can be kept shorter than a traditional in-line engine, and it is also lighter. The engine can be mounted lower in the vehicle than other engines, lowering the centre of gravity of the car, and weight balance on the left and right can be made almost identical. This improves the symmetrical balance of the entire car and these factors combine to deliver a safer, more stable, and ultimately, more enjoyable experience on the road.
These qualities apply equally to the Boxer Diesel, achieved by keeping its weight and size as low as possible despite the greater strength and rigidity requirements of a diesel engine. The result is a more compact combustion chamber and greater fuel efficiency, all while retaining the sporty engine feel inherent in the Subaru Boxer layout.