Abstract
The work reported here was aimed at predicting changes in the viscosity of marine diesel oils during the operation of engines that are in good condition, in order to obtain baseline relationships between the viscosity and the content of insoluble products of oil aging. The use of these relationships as standards will provide a sounder basis for interpreting the results of viscometric analysis. Many studies have been reported on the influence of oil aging on oil viscosity. The main factor influencing the increase of oil viscosity is contamination of the oil with insoluble sludge. A certain increase of viscosity also takes place as a result of the formation of oil oxidation products. Some of these products are insoluble in the oil and are regarded as a solid phase. The remainder of the products - oxidized hydrocarbons, alcohols, aldehydes, ketones, and other compounds - are soluble in oil at the temperatures prevailing in the crankcase, and these are also capable of increasing the oil viscosity. According to our experimental data, the share of the oxidation component in the total increase of viscosity is no greater than 10%; this is consistent with results obtained previously in (5-18%).
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