History of gasoline in Spain’s first gasoline marketed in Spain had no particular designation. This was to lead and 85 octane. In the 80s and the evolution of the engines was increased to 91 octane, and in turn began to market a leaded gasoline higher octane, 97, who called Super Gas. Thus, the previous petrol gradually began to be known as regular gasoline. In this way the stations offered for many years Normal 91 octane petrol and 97 octane unleaded gasoline. In 1988 he began mass marketing engines that use unleaded gasoline, which began marketing the so-called Unleaded petrol Unleaded 95 and 98.In mid to late 90s the use of unleaded petrol began to be significantly higher than that of leaded petrol (end 1999 40 of all cars on Spanish roads used leaded petrol) so over the decade were recalling Normal Gasoline least 91 with growing demand, leaving only the gasoline Super 97 as leaded gasoline. When the European Union put the legislation on which they would withdraw all of leaded petrol from the market before January 2001, Spain was granted an extension because of the number of vehicles that consume these types of leaded fuels which still existed in national territory . As of August 2001 began to phase out leaded petrol Super 97, and finally, in January 2002, to prohibit by law the sale of any type of leaded gasoline. In April 2001, gasoline consumption Super accounted for 28.5 of total gasoline.On the other hand, oil companies offered a substitute for leaded petrol Super 97 were introduced in the market at the same time that they withdrew it. According to oil his name was different: Repsol YPF “New Super 97”, Cepsa, “New super”, and BP, “BP 97 Ecos per lead substitute.” The new gasoline, slightly more expensive, included an additive based on potassium (K) that replaces the lead. Yet, despite being less polluting than lead, the government ordered its withdrawal by the end of 2005. The main objective was the massive withdrawal of vehicles that consume too much and produce a lot of pollution, due in large part by not having catalyst (only possible in engines using unleaded fuel.) Also the high price of this replacement led to his retirement. In 2004, premium gasoline consumption accounted for 12 of petrol. From 2006 there were only at the pump Unleaded Unleaded 95 and 98.Those who want to use motors that do not support or unleaded gasoline substitute, could acquire the replacement of potassium addition and mixing it with gasoline, though it was recommended as far as possible put the engine to be used with unleaded petrol, and develop a catalyst.