Lubricating oil is divided into fully synthetic lubricants, semi synthetic lubricants and mineral lubricating oil. Sl grade car engine oil with bluestar independent intellectual property rights of formulation and technology, save fuel and reduce oil consumption. It is an environmentally friendly energy saving gasoline engine oil. It effectively prevent the formation of low temperature corrosion and precipitation.the excellent clean decentralized nature provide reliable high temperature wear protection and reduce oil consumption for high mileage frequent when start and stop. Prolong the service life of the engine.