Tetra Ethyl Lead (TEL) was initially added to petrol for engines with high compression ratios and high power output. This reduced pre-ignition (pinking) and associated engine destruction. Improved valve seat lubrication and longer valve seat life were added benefits.
If your older vehicle has a high compression ratio, a fuel additive needs to provide 2 solutions.
(1) Increase the octane level to reduce pre-ignition (pinking) and associated engine destruction.
(2) Provide improved valve seat lubrication for longer valve seat life.
If your older vehicle has a high compression ratio, installing hardened valve seats is only a partial solution.
Classic Motoring published A Guide to Unleaded Additives that explains the above problems in more detail.
http://www.classiccars4sale.net/classic-car-how-to-guides/restoration/a-guide-to-unleaded-additives
If you live in the USA, Bardahl Instead O’Lead Gold (lead substitute) meets the above requirements. For other countries, refer to the above A Guide to Unleaded Additives. It is also best to stay with the same additive.
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