According to the professionals to explain, the quality of the gasoline is an important performance index called gasoline, its octane number parameter name, according to the method of automobile engine test, divided into two kinds: one kind is called research octane number, also is the label used in domestic; the other is called a motor octane value, American using this as a label. Different methods of measurement, leading to label the difference between. At the same time, the industry said, most of the USA oil gas station is from 87 to 93, generally speaking, 87 ordinary grade, 89 for silver and 93 for gold. Most people still use the ordinary level, also is the No. 87 oil. It is reported, China oil label No. 90 is equivalent to America oil label No. 82; Chinese No. 93 oil and USA No. 85 oil equivalent; China numbered 97, oil is equivalent to America No. 87 oil.     

The owners of the Sinopec and PetroChina's misgivings about constantly. The most puzzling to demand greater No. 90 gasoline gradually withdraw from the market. According to Sinopec and PetroChina official said, No. 90 oil out of the market is the key to reduce and the national policy of its market demand need clean fuel. But for this interpretation, can not accept, the owners owners that, different oil label only represents the antiknock sexual differences instead of clean or not.