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Due to the rapidly increasing raw oil price the reduction of fuel consumption has become one of the most important targets for the development of modern passenger car engines. After large progress has been achieved in the combustion process development - CAE has been one of the keys to success - nowadays further potential is being investigated. The mechanical friction is very much in the focus of the engine development engineers. While in the Valve Train the potential of roller contacts and surface treatment is the main development direction, in the cranktrain the reduction of bearing diameters is being investigated. Due to increasing specific loads on the crankshaft there are clear limits. At the piston group the potential is almost untouched. While optimizations of the piston skirt contour or the ring pack bring up the risk of negative influences on blow by and oil consumption, the application of a crank offset is an easy design measure having almost no risks.