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Download the report (iis12L01) on the Unused Lubricating Oil
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Summary of the proficiency tests:
On 19 Juny 2012, the report on Unused Lubricating Oil was finished. The proficiency test started on 21 April 2012 (see message "Proficiency Test on Unused Lubricating Oil started" on this website) when the samples were distributed.
In this interlaboratory studies 90 participants in 50 different countries have participated.
The participants were requested to perform the following tests : Acid Number, Base Number, Colour, CCR, Density @15°C,
Flash Point COC and PMcc, Kinematic viscosity @40°C, Kinematic viscosity @100°C
Viscosity Stabinger @40°C, Nitrogen, Pour Point, Sulphated ash, Sulphur,
Water and the additives Ca, P and Zn.
The proficiency test report summarises per test, the
test results, the analytical methods reported by the participants and the
z-scores calculated by i.i.s. for each participant are tabulated. Also, for
each test, the calculated summary (e.g. mean, standard deviation and
reproducibility) is given. In the report also an evaluation of the test results is
given. Problems encountered in the analyses are mentioned and - where
possible - suggestions for quality improvement are formulated. For each test
a comparison is made between the results of the group of participants and
the requirements given by the relevant standard (e.g. ISO, DIN, ASTM).