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In page Wankel engine:

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Leaded gasoline was the predominant type of gasoline available in the first years of the Wankel engine's development. Lead is a solid lubricant, and leaded gasoline is designed to reduce the wearing of seals and housings. Early Wankel engines had an oil supply that only provided lubrication where leaded gasoline was insufficient. As leaded gasoline was being phased out, Wankel engines needed an increased mix of oil in the fuel to provide lubrication to critical engine parts. An SAE paper by David Garside extensively described Norton's choices of materials and cooling fins.[citation needed]