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Lead is deliberatly designed for one purpose - to lubricate valves. The only downside I can see is if you have a cat. Otherwise I would think it would be beneficial, which is what my mechanic also maintains. Cars of olders desigen, particularly with iron block and heads are suffering from valve recession when running at higher rpm or carrying heavy loads. A fact that is being widely acknowledged in Australia and UK where lead has been phased out of petrol and replaced by a poor substitute.
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1986 951 Euro spec model
Anthracite on black
105,000 km
K&N, Lindsey Boost Enhancer, chipped, oversize fuel regulator
968 Club Sport anti sway bars
Adjustable Koni Yellows
Fuchs alloy : 9 inch rear, 7 inch front
2.5 inch stainless steel exhaust
1984 928 S2 (Jap spec)
1977 Mazda 323 - hard core tuned
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