The paper describes the current use of magnesium in cars and gives an outlook about the future development. This will be done by means of the vehicle modules drive train, interior, body and chassis by the use of realized and potential future magnesium components, differentiated according to a time frame. R & D activities for the implementation of the predicted use of magnesium are illustrated by example components and projects. Mg components in the body, Mg-sheets and Mg-extrusions applications will appear initially in niche-market and premium vehicles. This can prepare the way for and eventually lead to greater use of Mg in volume-production models as part of a multi-material design concept. The essential prerequisites for such increased use of magnesium as well as the necessary R&D strategy will be discussed.