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Download the report (iis15L04) of this Proficiency Test on Engine Oil (Fresh)

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Summary of this proficiency test:

On 31 August 2015, the proficiency test on Engine Oil (Fresh) (iis15L04) was finished. It started on 20 May 2015 (see message "Proficiency Test on Engine Oil (Fresh) started" on this website) when the samples were distributed.

In this international interlaboratory study 73 participants in 40 different countries have participated.

The participants were requested to determine 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 /@100°C ,Analysis Run Time, Viscosity Index, Apparent Viscosity, Rambottom Carbon Residue, Nitrogen, Pour Point, Sulphated ash, Sulphur, Foaming Tendency,  Foam Stability, 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 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. ASTM).