NSH GER Gas engine oil regeneration System is particularly suitable to regenerate and refine internal-combustion engine oil including diesel engine oil, gasoline engine oil and internal-combustion engine oils. GER used oil re refining series can effectively remove colloid, oxid, acid, pitch, particles, impurities, water, gas in the oil. Specially, GER used oil refining machine can restore the color of used internal-combustion engine oil and remove the scent rapidly.