Engines
Phillips 66 Teams With Afton on Unleaded Avgas
UL100 avgas contains no lead and so far is proving effective for anti-detonation properties in high-compression piston aero engines.

Phillips 66 and Afton Chemical are working together to develop and distribute an unleaded 100-octane avgas (UL100) that would eliminate dependency on the leaded 100LL currently used by most piston-engine aircraft. Afton Chemical is a subsidiary of Newmarket Corporation, which also owns Ethyl Corporation, a supplier of additives used to manufacture 100LL.


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