Subaru's world's first boxer diesel en-gine is part of a symmetrical AWD drivetrain layout, which mounts the horizontally opposed engine and transmission longitudinally. The Boxer engine technology, which is said to be a particularly dynamic engine concept as the flat positioning of the pistons enables the engine to be located further down such that the vehicle's centre of gravity is lower, for the first time has been transferred to diesel. Subaru uses ZF driveline technology for the boxer diesel engine. The dual-mass flywheel from ZF ensures that engine vibrations are decoupled from the driveline. To ensure that the new diesel variant does not lag behind in terms of quiet running compared with standard diesel engines, Subaru has ordered the ZF Sachs dual-mass flywheel, that is basically "tailor-made" for the boxer diesel engine. The clutch provides for fast and comfortable gear changes. ZF Sachs engineers were integrated in the development of the new engine and ensured that the drive technology perfectly matches the new engine concept. The development departments in Schweinfurt cooperated smoothly with the ZF Japan Tech-Center during the development of the dual-mass flywheel. 

 In the Subaru Legacy and Outback models, torsional vibration of the Boxer diesel engine are decoupled from the driveline by the ZF Sachs dual-mass flywheel, saving the transmission and increasing driving and ride comfort. The dual mass flywheel also enables driving at low engine speeds and thus contributes to reducing fuel consumption. ZF will be supplying 35,000 dual-mass flywheels and clutches to Subaru in the year 2008. These will add to the ten-million dual-mass flywheels produced by ZF Sachs from 1999. Production is located in Schweinfurt and Trnava, Slovakia.