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K. Steinschütz, M. Urbanek, T. Wopelka, M. Jech, N. Doerr, F. Novotny-Farkas, C. Lenauer:
"Effect of Oil Aging due to Bio-Fuels on wear of Piston Ring and Cylinder Liner System";
Talk: 65th STLE Annual Meeting & Exhibition, Las Vegas, USA (invited); 05-16-2010 - 05-20-2010; in: "Society of Tribologists and Lubrication Engineers Conference Proceedings from the STLE Annual Meeting 2010", (2010), 3 pages.

One of the main aspects of oil aging in a combustion engine can be related to dilution of the lubricant with
fuel and its combustion products as well as their interaction with the components of the lubricant. These
interactions lead to a decrease of base reserve in the lubricant and probably to an undesirable interaction with
anti-wear additives. Consequently, systematic research work is required to clarify the impact of oil aging on the
wearing behaviour of the correlated tribosystems.
The work is focused on the effects of artificially aged oils on the wear behaviour of the model system
piston ring and cylinder liner. The tribological performance is investigated using a novel wear measurement
method based on online and continuous detection of radioactive isotopes as wear tracers. These investigations
are carried out in a tribometer in order to differentiate between single impacting parameters, such as selected fuel
components, as well as in an engine test bench to cope with the multiple impacting parameters of the real
application.