Summary
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1.
When operating an engine on additive oil, in addition to chemical interaction of the additive with products from fuel combustion and oil oxidation, additive adsorption processes occur on the engine parts.
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2.
The sharp decrease in concentration of active additive in the oil during the first hours of operation is explained mainly by adsorption of the additive on engine parts (and in filters, when present in the lubricating system). During subsequent operation, part of the adsorbed additive is desorbed and returned to the coil.
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3.
Since adsorption processes during the first 30 to 50 h of test distort the true curve of additive consumption in neutralizing products from fuel combustion and oil oxidation, the trends established by short-term tests cannot be extrapolated to longer periods of oil service.
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Literature cited
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Vorozhikhina, V.I., Nepogod'ev, A.V. & Ryazanov, L.S. Adsorption processes in the exhaustion of additives. Chem Technol Fuels Oils 1, 881–883 (1965). https://doi.org/10.1007/BF00719196
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DOI: https://doi.org/10.1007/BF00719196