NSH GER Gas engine oil (oil Treatment, oil Filtration, oil Purification, oil Recycling, oil Filter, oil Restoration, oil Regeneration, oil Filtering, oil Reclamation) System is particularly suitable to regenerate internal-combustion engine oil including diesel engine oil, gasoline engine oil and internal-combustion engine oils. GER series can effectively remove colloid, oxid, acid, pitch, particles, impurities, water, gas in the oil. Specially, GER can restore the color of used internal-combustion engine oil and remove the scent rapidly.