Castrol was once a unicorn in the world motor oil market, the only independent motor oil company in the world, and was later acquired by BP (British Petroleum), a giant in the petroleum and petrochemical industry. As a world-renowned lubricant expert, Castrol is backed by the world's fifth-largest oil company and also has excellent oil research and development capabilities. Castrol EDGE is certified by the American Petroleum Institute API to SN level. However, in terms of the layout of the whole industry chain and cooperative auto manufacturers, Castrol still has a certain gap compared with Mobil, Shell and Great Wall. Castrol GIL's 0W-40 viscosity grade engine oil is priced at 4 liters of 618 yuan in China, which is much cheaper than Mobil 1 and Shell Extreme Clean Helix Extraordinaire, but the oil change mileage can still be maintained at about 10,000 kilometers, so it is recommended to purchase at the official designated sales point.