It is well known that the reduced stability of FAME diesel fuel blends is of particular threat to diesel engines and especially high pressure common rail (HPCR) systems operation. As has been ascertained, internal diesel injector deposits are more likely to form in modern diesel fuel systems because of their higher operating pressures and temperatures, which can intensify oxidation and decomposition of the chemically unstable components of diesel fuels, particularly those contained in FAME. This paper presents the results of accurate and sensitive evaluation of laboratory test methods for the determination of oxidation, storage and thermal diesel fuel stability, verified via dynamometer engine testing, from the point of view predicting the possibility of threats caused by aged diesel fuel with various FAME contents for HPCR in-system performance. (C) 2015 Elsevier B.V. All rights reserved.