METHOD OF REDUCING THE TOXICITY OF USED LUBRICATING COMPOSITIONS

摘要

Method of reducing the toxicity of a used lubricating composition comprising fuelling a diesel engine containing the lubricating composition with a diesel fuel composition which comprises Fischer-Tropsch derived gas oil. The present invention also relates to a used lubricant, the used lubricant having been obtained from a diesel engine fuelled with a fuel composition which comprises Fischer-Tropsch derived gas oil, wherein the used lubricant has a Mutagenicity Index of less than 0.5 as measured by the Modified Ames Test Method.