It's not just lead, it's Tetraethyllead. An organolead compound with the formula (CH3CH2)4Pb.
http://en.wikipedia.org/wiki/Tetraethyllead It was originally added to boost the octane of gas. It was later found that exhaust valves would burn up quickly without it. This was overcome in later years by the use of hardened valve seats.
Putting a small amount of lubricant in your gas will effectively lengthen the life of your valves. A quart of diesel fuel for 20 gallons will do the job and not change the way the motor runs otherwise.
read the label on any bottle of lead substitute, study the chemical names. It's diesel fuel that has been repackaged and is way over priced.
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