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What is the best lead additive on the market for four-star petrol?

I have a 1958 Bentley S1. What is the best lead additive on the market for four-star petrol?

Asked on 20 January 2020 by RON FORREST

Answered by Keith Moody
We've always opted for Castrol Valvemaster, but there are plenty of options that you can try until you find the one that works best for you and your car.
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