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K. Steinschütz, B. Geringer, M. Urbanek, M. Jech, T. Wopelka, C. Besser:
"Impact of Oil Aging on Wear of Piston Ring and Cylinder Liner";
Talk: 2010 Small Engine Technology Conference, Linz (invited); 2010-09-28 - 2010-09-30; in: "2010 Small Engine Technology", D. Nehmer et al. (ed.); SAE International, (2010), Paper ID SAE Technical Paper 2010-32-0124, 7 pages.

The piston ring and cylinder liner tribosystem is very
sensitive. It is a heavily loaded system with high temperature
and force exposure. High demands are made on the
components in this area. These facts concern not only system
components, but also the engine oil which can reach up to
300°C at the inner cylinder walls. High temperatures and
force cause oil aging.
As a part of the combustion chamber, the piston ring-cylinder
liner tribosystem is in close contact with combustion
constituents. If alternative fuels like ethanol are used, the
influences to this tribosystem have to be investigated. In
particular, the impacts of oil aging have to be considered to
avoid higher wear and damage to the engine, to assure low
fuel consumption, and to extend oil change intervals.
Research work on abrasion of the ring-cylinder system was
aimed to gain detailed information about the effects on this
tribosystem. This was realized by the use of different engine
oils and the experimental consideration of the impacts of
ethanol on the oil.
For wear measurement, a novel measuring method is used.
This measurement device is based on online and continuous
detection of radioactive isotopes as wear tracers. The
measurement device has been integrated to a conventional
passenger car with an SI engine. The research was done on a
chassis dynamometer test bench.