AbstractThe performance of the 617‐Rancimat(R), an automated analyser made by Metrohm of Switzerland, for determining the oxidative stability of edible oils (Active Oxygen Method) has been examined in an interlaboratory test. The performance of this version of the Swift stability test, carried out by eleven laboratories in the Netherlands and the United Kingdom, was investigated with regard to the determination of the induction period of the oxidative stability of rapeseed oil and palm oil under standardised conditions. Statistical analysis of the results obtained with the 617‐Rancimat(R) instrument showed a satisfactory within‐laboratory repeatability (5%). Between laboratories, the dispersion of the results around the mean value was rather large (10%).