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Polyol ester-based diesel engine lubricants which achieve maximum theoretical high-temperature performance have been developed in our laboratories during the past three years. New lubricant basestocks and additives are currently being developed to perform under more severe thermal conditions, anticipated in low heat rejection diesel engines at the turn of the century. In this paper, the status of our current laboratory development and evaluation of new diesel engine lubricants, with high-temperature applicability beyond polyol esters, is summarized. Our final work in the polyol ester class of lubricants, through single-cylinder engine tests, is also presented.