Abstract
This article presents research on the lubricating properties of semi-synthetic oils, made as compositions of mineral oil and esters. The esters were synthesized from acid substrates from the oxidation of paraffins. The last non-seizure load (Pn), the weld point (Pz), the load wear index (Ih), and the limiting wear load (Goz) were measured, and the effects of additives or mixtures of additives were investigated by their effects on these parameters. It was found that the efficiency of the additives depended on their chemical characteristics and concentration, and also on the chemical nature of the ester component of the semi-synthetic oils.
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