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Diesel engines are prime movers on a world wide scale for heavy duty trucks. Their market share in passenger cars, however, varies considerably between countries; depending on fuel prices, local fuel/car taxation and acceptability to private motorists. Pressures to reduce fuel consumption (CO2 emissions) and operational costs have increased the market share of diesel engines in new car sales to over 40% in some countries. At the same time diesel engine technology for trucks, buses and passenger cars has improved considerably with significantly higher performance, lower emissions and excellent customer acceptance. To reach all these goals, fuels, lubricants and coolants must meet high quality standards. In this respects fuel additives can contribute considerably to such performance aspects, and improve fuel quality in a cost effective manner.