[DanEC]

The only true, genuine lead fuel octane additive that I knew to be available was from Kemco. It was strictly a mail order product and was not legal for road use. I have most of a case of it still for my older cars and it's potent stuff. I want to wear heavy rubber gloves and a respirator when putting it in the tank. But I understand the owner died a few years ago and it's off the market now. I don't know of anything comparable.