Penn State Multi-Discipline Tribology Group and Energy Institute Studies. Page: 4 of 11
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The wear characteristics of all of
the oxidized fuels were better than the
unoxidized low sulfur fuel. Typical data
are found on Figure 5.
Testing was conducted using
various concentrations of the oxidized
fuels in the diesel fuel. The concen-
trations ranged from 0 to 20% . Both
friction and wear were measured. The
optimum effect on wear was obtained
with approximately 10 % by weight of
the oxidized fuels in the low sulfur
diesel fuel. Friction was lower in all
o First 30 Min.
0 Second 30 Min.
Diesel Ox. Diesel B20
vegetable oils, chemically modified oils
and additive effectiveness in a wide
range of applications.
All three of these approaches can
be shown to improve the oxidation
stability of the vegetable oils studied,
allowing formulation of single and
multi-grade lubricants that perform in
laboratory tests as well as petroleum
base oils. Coupled with the low
volatility and excellent viscosity-
temperature properties, the vegetable
oils become more attractive as engine oil
In the current studies, the effect
of the material surface on the thermo-
oxidative properties of lubricants and the
use of coatings to passivate the surfaces
in an engine is demonstrated.
Oxidation and volatility studies
are conducted using the Penn State
Microoxidation (PSMO) test, Figure 6.
Fig.5. Effect of Oxid'n of Fuels on Wear
The research on oxidized fuels
demonstrates one approach to reducing
friction and wear in low sulfur diesel
fuels. Studies on the effectiveness of the
increase oxygen content of these fuels on
particulates needs to be determined.
Research on vegetable oils as
hydraulic fluids, industrial oils and
engine oils at Penn State is continuing.
It is aimed at improving the oxidation
stability and the low temperature
properties of these oils [6-9]. Research
involves the use of genetically modified
Fig.6. Thin-fdm PSMO Test Unit 
In this thin-fdm test, 40 ul of
test fluid is put under an inert (nitrogen)
or an oxidizing (air) atmosphere at
selected conditions and the volatiles,
oxidized products and deposits
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Perez, Joseph. Penn State Multi-Discipline Tribology Group and Energy Institute Studies., article, August 5, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc780351/m1/4/: accessed September 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.