The catalytic properties in the n-hexane oxidation reaction of five nanocrystalline(1) LaCo(1-x)FexO3 perovskites prepared by mechanosynthesis were studied. The characterisation of such samples was reported in Part I of this contribution. One of the advantages of this mechanosynthesis technique stems from the low preparation temperature, which allows to stabilise high surface area materials. In Part I, the unusual properties of these new materials were illustrated for LaCoO3 and LaCo(1-x)FexO3 perovskites [1]. It was shown that controlling the calcination conditions allows to tailor the surface properties of these materials. In Part II, a preliminary account of the catalytic behaviour of such catalysts in n-hexane oxidation was reported [2]. In the present contribution, the fine control of the nature and the concentration of the various sites active in redox catalysis is demonstrated through a kinetic study of the total oxidation of n-hexane by oxygen. The roles of two oxygen species O-2(-) and O-, respectively, associated with alpha and beta oxygens are discussed.