Reply to "Unleaded fuel compatibility question"

dougmMember

It also acts as a lubricant for the valve train

"Tetraethyl lead works as a buffer against microwelds forming between the hot exhaust valves and their seats.[4] Once these valves reopen, the microwelds pull apart and leave the valves with a rough surface that would abrade the seats, leading to valve recession. When lead began to be phased out of motor fuel, the automotive industry began specifying hardened valve seats and upgraded exhaust valve materials to prevent valve recession without lead."

If your engine is all original inside then an additive is a good idea.

Doug M

4/14/147:58 PM

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