Gasoline with No. 87 octane show that combustion efficiency as the ingredients are isometric octane 87, and Normal heptane 13 of gasoline at the gas engine gasoline vehicles currently have. No. 91 and 95 octane gasoline at the refinery, but has a lower octane number 75, so you must add certain chemicals to the oil. In the past, the addition of lead tetrachloride, methyl or ethyl lead tetrachloride, which have been burning the oil vapor will lead out with the car's exhaust. Which pose a danger Currently, many countries have banned the use of these additives in the oil. And has switched to the terminal methyl butyl ether Shea Tree (MTBE) to gasoline and run this type. Unleaded talents of Luoyang.