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Leaded gasoline has been illegal to sell for use in licensed street driven vehicles in the US since January 1, 1996.

Leaded gasoline is restricted to two uses in the United States: Sanctioned

Racing Events and Aviation...Older cars can use unleaded Gasoline but you may have to richen the mixture some to maintain the same performance and If your vehicle is older than 1970 you may have to install hardened exhaust valve seats or use a lead substitute which is added to the gas tank..

Vehicles that used leaded gasoline had a lower rate of part replacement for such things as valves,rings and pistons,also there was less wear on the cylnder walls,this was because the lead in the gasoline acted as a type of lubricant..

There are several brands of lead substitutes which are synthetic and safe to use if you have an older car that needs leaded gasoline these are available at most all parts/automotive stores..

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Q: Why do old cars still need leaded gasoline?
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