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ive always been told that on an original motor that used lead, theres a chance of ripping the valve heads to shreads with out it. about 50% of the people say it will happen, the other 50% says it wont.
at 10 bucks a bottle thats good for about 250 gallons of gas, i figure why not. id rather be dumping cheap snake oil in and have nothing happen then find out i really did need it.
Tetraethyl lead was formulated in the 1920's to raise octane, period! It is highly toxic, and all the reasearchers that developed it DIED of toxic lead poisoning. Although the lead does form a film on valves and seats, cars ran and lasted fine without it from 1900 to 1930.
Ask the 50% that say it will happen for actual examples, real proof instead of just 'I heard of a guy who knows a guy' BS. There's no known examples of valve seats on a Corvette motor being damaged by lack of lead.
More importantly- if the additive you're using has real lead in it, (and most don't) diluting one bottle in 250 gallons of gas is having no effect. You'd need three or four bottles PER TANK OF GAS to come back to the levels of lead in gasoline equivalent to when your car was new.