We oxidized three isomers of methylcyclohexene with O 2 -N 2 mixtures in a jet-stirred reactor at 10 bar, in the cool flame regime, and fuel-lean conditions. Samples of the reacting mixtures were collected, dissolved in acetonitrile, and analyzed by high-resolution mass spectrometry. A huge set of oxidation products, including highly oxygenated chemicals, aromatic and polyunsaturated products was obtained.