Solvolysis of oil palm empty fruit bunches (EFB) fibres using different solvents (acetone, ethylene glycol (EG), ethanol, water and toluene) were carried out using an autoclave at 275 degrees C for 60 min. The solvent efficiency in term of conversion yield was found to be: EG > water > ethanol > acetone > toluene. The liquid products and residue obtained were analyzed using Fourier transform infrared spectroscopy (FIR) and gas chromatography/mass selectivity. The obtained results showed that the chemical properties of the oil product were significantly affected by the type of solvent used for the solvolysis process. The higher heating value (HHV) of oil products obtained using ethanol is similar to 29.42 MJ/kg, which is the highest among the oil products produced using different solvents. Water, ethanol and toluene yield major phenolic compounds. While EG favors the formation of alcohol compounds and acetone yields ketone and aldehyde compounds. (C) 2010 Elsevier Ltd. All rights reserved.