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Synthetic Diesel-like soots were prepared according to a methodology reported in the literature, and their physico-chemical characteristics and properties determined as a function of the operating parameters. These Diesel-like soots were synthesized following a two stage process where carbon-black oil mixtures were firstly oxidized at 400 °C in a tubular furnace and the resulting solid was next oxidized between 75°C and 175 °C. The products obtained after the removal of residual oil were characterized morphologically, via elemental analysis, solid state 13C-NMR, XPS and rheologically. Results were compared with those achieved from the characterization of a “reference” soot sample extracted from an oil recovered after an XUD11 engine test. Synthetic soots have chemico-physical characteristics that are different than those of the precursor carbon black and that can be controlled changing the operative conditions of the second step of the synthesis.