In the Mercedes-Benz S 400 d, the new in-line six-cylinder diesel engine makes its début. It comes with 250 kW (340 hp) and 700 Nm. Even though it has noticeably more power than its predecessor, the new engine consumes over seven percent less fuel. The special traits of the top-of-the-line engine in the diesel family include the stepped-bowl combustion process, two-stage turbocharging and for the first time the use of CAMTRONIC variable valve-lift control. Its design features a combination of aluminium engine block and steel pistons as well as further improved NANOSLIDE® coating of the cylinder walls.