A solvent extraction process has been used to recycle the used engine oil. The solvent used for the treatment of used engine oil is a mixture of ethanol, 1- butanol and toluene. The effect of operating parameters on the recycling process has been investigated for optimal conditions. The process parameters considered were agitator speed for blending, boiler temperature and solvent to used oil ratio. The maximum recovery for refined oil was 72% using solvent to used oil ratio of 9:1 at a boiler temperature 120° C and agitator speed of 600 rpm. The maximum solvent recovery of 98% was also obtained at the same process conditions.