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The aim of this paper is to show how a combination of bench tests measuring relevant lubricant properties allows the influence of oil formulation on gasoline engine fuel economy under different operating conditions and in different engines to be predicted. Correlations of bench test data with performance in both Sequence VI and Sequence VIA engine tests are demonstrated.

Additive technology has been used to enhance the quality of automotive diesel fuel in a number of important areas of performance. This paper focusses on the role of new additive technology in two important areas: 1. Maintenance of designed performance of injector systems: 2. Prevention of problems associated with fuels designed to respond to tighter emission regulations. Field and laboratory data have been generated in industry and in-house procedures. The implications of these results are discussed.