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In 1971, the oil companies began development of a single grade avgas that would meet the
needs of all reciprocating powered aircraft. When 80/87 began to disappear from the
avgas market and 100LL was introduced to take its place, operators expressed concern about
the service life expectancy of their low compression engines. Some operators experienced
accelerated exhaust valve erosion and valve guide wear from the use of highly leaded
100/130 (green) avgas in engines that were rated to use a minimum grade 80 octane fuel.
The engine manufacturers were quick to provide aircraft owners with amended operating
procedures and maintenance schedules which helped minimize the engine malfunctions
resulting from the use of high lead 100/130 avgas. Experience of the past ten years has
proven that low compression aircraft engines can be operated safely on 100 low lead (LL)
avgas without difficulty, providing they are operated and serviced in accordance with the
approved aircraft owner's manual or other officially approved document.
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