Proficiency Tests on Gear Oil finished

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Download the report (iis16L01) of the Proficiency Tests on Gear Oil

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Summary of this proficiency test:

On 13 June 2016, the proficiency test on Gear Oil (iis16L01) was finished. It started on 16 March 2016 (see message "Proficiency Test on Gear Oil started" on this website) when the samples were distributed.

In this interlaboratory study 18 laboratories in 14 countries have participated.

The participants were requested to determine on Total Acid Number, Density @ 15°C, Flash Point PMcc, Kinematic viscosity @ 40°C, Kinematic viscosity @ 100°C, Copper Corrosion, Viscosity Index, Viscosity Stabinger at 40°C and at 100°C, Pour Point Manual/ Automated, Sulphur, Water Separability, Rust Preventing, 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 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, ASTM).