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2023 Proficiency Test (PT) on Gasoline-EN (winter) started


The letter of instructions can be downloaded here as a pdf document. To download a document, please click the right mouse button and choose the "save as" option.


Please download the instructions for the PT iis23B06EN here: the letter of instructions

Download the instuctions for iis23B06DVPE here: letter of instructions for DVPE

Download the instuctions for iis23B06RON here: letter of instructions for RON/MON


Summary of this proficiency test:


On 13 September 2023 the proficiency test on Gasoline-EN (winter) started with 148 participants from 54 different countries. On that date, the samples were dispatched to the laboratories. Enclosed to the sample is the material safety data sheet (MSDS).

Please confirm sample receipt as soon as you have received and checked the contents of the sample package via Please enter the date of receipt and press the "save date" button.


The samples can be analyzed on: API gravity, Appearance, Aromatics, Benzene, Copper strip 3hrs at 50ºC, Density at 15ºC, Distillation, Doctor test, Existent gum (washed), Pb, Mn, Olefins, Oxidation Stability, Oxygenates, Oxygen Content, Sulfur, Total Vapour Pressure, DVPE and RON/MON. 


The deadline for reporting results is set on 20 October 2023. A laboratory that reports test results after the deadline will definitely not get direct feedback in case any of its results are suspect! So be in good time to get the most out of this proficiency test.

The test results should be reported via our internet based results reporting platform A login and a password can be requested via email to





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