The provision of a system-wide global time base with good precision and accuracy is a fundamental prerequisite for the design of a time-triggered automotive real-time control system. In this paper we investigate the issues of clock synchronization in such a system. Our synchronization scheme allows every node to have a different oscillator. Based on typical parameters we derive the achievable precision and accuracy, which is in the microsecond range. The description of a prototype implementation shows the applicability of our approach.