Abstract
Modern engine oil formulations usually contain many kinds of additives, such as detergentdispersant additives, antiwear additives, antioxidants, VI improvers, rust inhibitors and friction modifiers. What these additives do in the crankcase, however, is not fully understood. As a first step in clarifying the complex mechanisms of engine oil performance in the crankcase, the interaction of additives in binary systems were studied. The interaction between engine oil additives in cyclohexane were determined by means of modified differential vapor pressure osmometry. No interaction was found between metallic detergents and ZDP, but succinimides were found to interact strongly with metallic detergents and ZDP. The strength of the interaction was dependent on the structure of the succinimides.
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