As part of a complete-engine development project by Mahle, various optimisation measures were investigated on a modern baseline engine and analysed for their ability to improve the friction behavior of the engine. In addition to evaluation criteria such as feasibility and cost, the main emphasis was placed on increasing the effective efficiency in the partial load range. Thus, one of the main criteria during the final analysis of each optimisation measure was a reduction in specific fuel consumption and CO2 emissions both in stationary operation and during the driving cycle.