| Abstract: | During oxidation of an engine oil under laboratory conditions, and testing in a single-cylinder gasoline engine, it has been found that oil ageing depends on the copper content, in particular the oil-soluble copper salt content. The latter considerably intensifies engine oil oxidation, loss in bearing weight, and piston deposit formation. Several regularities in the oil ageing process were found. It was noted that interaction of copper naphthenate with zinc dithiophosphate essentially influences this process. |
