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and in the engine oil. It may require increased spark plug maintenance and more
frequent oil changes. The frequency of spark plug maintenance and oil drain
periods will be governed by the amount of lead per gallon and the type of
operation. Operation at full rich mixture requires more frequent maintenance
periods; therefore, it is important to use proper approved mixture leaning
procedures. Reference the latest issue of Lycoming Service Letter No. L185 for
care, operation and maintenance of the airplane when using the higher leaded
fuel.
A summary of the current grades as well as the previous fuel designations are
shown in the following chart:
OIL REQUIREMENTS
The oil capacity of the Lycoming O-360-A3A is 8 quarts, and the minimum safe
quantity is 2 quarts. It is recommended that the oil and oil filter be changed
every 50 hours, or sooner under unfavorable conditions. Intervals between oil
changes can be increased as much as 100% on engines equipped with full flow
cartridge type oil filters, provided the element is replaced each 50 hours of
operation and the specified octane fuel is used. Should fuel other than the
specified octane rating for the power plant be used, refer to the latest issue of
Lycoming Service Letter No. L185 and Lycoming Service Instruction No. 1014 for
additional information and recommended service procedures.
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