GAMI Gets STC for Unleaded AvGas for Popular Lycoming Engines

Julie Boatman

Wednesday, July 28, 2021 at 03:50 PM ET

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The O-360 horizontally-opposed engine powers a wide range of light GA aircraft. Courtesy Lycoming

Key Takeaways:

General Aviation Modifications, Inc. (GAMI) has received an STC for its G100UL unleaded avgas for Lycoming O-320, O-360, and IO-360 engines, a significant step towards replacing leaded fuels in piston aircraft.
The G100UL fuel, developed over years of research, is a proprietary high-octane solution optimized for specific 4-cylinder, normally aspirated engines that power a portion of the light general aviation fleet.
Major GA associations like GAMA, EAA, and AOPA commend GAMI's achievement but emphasize this is a "positive first step" and advocate for continued testing and expansion to a broader range of engines, including high-performance aircraft and helicopters, for a fleet-wide solution.

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General Aviation Modifications, Inc., (GAMI) has announced the STC for its G100UL avgas for Lycoming O-320, O-360, and IO-360 engines. The move came with broad support and cheering from those in the industry who have been working hard towards solving the problem of leaded fuels in piston-powered aircraft.

The STC comes after years spent by GAMI in the research and development of an unleaded avgas solution. This initial result is the proprietary, high-octane G100UL fuel, optimized for the series of normally aspirated, 4-cylinder engines that power a significant portion of the light GA fleet. It’s a step towards the big goal of a replacement fuel for 100LL that will incur no loss in safety and performance for those aircraft and can be delivered reasonably within the GA community.