In general, the oil produced by PetroChina and Sinopec is similar. Shell is a bit special. Shell's oil is called V-Power gasoline, which can clean the engine and prevent carbon deposits. Therefore, Shell gas stations do not sell any gasoline additives. So it stands to reason that Shell’s is better.

China Petroleum & Chemical Corporation (English abbreviation Sinopec Group) is a large-scale petroleum and petrochemical enterprise group established by the state in July 1998 on the basis of the former China Petroleum & Chemical Corporation. It is a state-owned company established solely by the state. State-authorized investment institutions and state-controlled companies. The company has a registered capital of 231.6 billion yuan, the chairman is the legal representative, and its headquarters is in Beijing.

China National Petroleum Corporation, the English abbreviation "CNPC", the Chinese abbreviation "CNPC") is an important state-owned enterprise. It is engaged in oil and gas business, engineering and technical services, petroleum engineering construction, petroleum equipment manufacturing, and finance. A comprehensive international energy company whose main businesses include services and new energy development, it is one of China's major oil and gas producers and suppliers. ?

Shell is a major international producer of oil, natural gas and petrochemicals, as well as a retailer of automotive fuels and lubricants. It is also a pioneer in the LNG industry and has considerable experience in financing, management and operations. It operates in 140 countries around the world and employs nearly 90,000 people. Its oil and gas production account for 3% and 3.5% of the world's total production respectively.