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The oil capacity of the O-320 series engine is 8 quarts, and the minimum safe quantity is 2 quarts. It is
recommended that the oil be changed every 50 hours and sooner under unfavorable operating 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. LI85 and Lycoming Service Instruction No. 1014 for additional information and
recommended service procedures. The following grades are recommended for the specified temperatures:
Temperatures above 60° F _________________SAE 50
Temperatures between 30°F to 90°F_________SAE 40
Temperatures between 0° F to 70° F________SAE 30
Temperatures below 10° F _________________SAE 20
All Temperatures________________________!5W-50 or 20W-50 Multivis Oils.
Either mineral oil or anti-dispersant oil may be used, but the two types of oil may never be mixed.
FUEL REQUIREMENTS
The minimum aviation grade fuel for the PA-18-150 is 80/87. The use of lower grades can cause serious engine
damage in a short period of times. Whenever 80/87 is not available, the lowest lead 100 grade should be used.
(See Fuel Grade Comparison Chart, next page.) Refer to the latest issue of Lycoming Service Instruction No. 1070
for additional information. Alternatively,
Alcohol Free MOGAS of 90 AKI or higher may be used in place of AVGAS.
The continuous use, more than 25% of the operating time, of the higher leaded fuels can result in increased engine
deposits, both in the combustion chamber 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.
The fuel gauge glass should be cleaned occasionally so that the fuel level indicator will always be readily seen. To
clean or replace the fuel gauges, first remove lower wing butt fairings. Pinch the rubber line to the lower gauge
fitting so that fuel cannot drain from the tank. Then remove the fuel gauges by pulling the fittings from the
connecting rubber tubes.
CARBURETOR AIR FILTER
1. Visual Inspection
A visual inspection of the Bracket BA-4108 element should be made at intervals not exceeding eight (8) hours of
operation or at any time after the filter has been subjected to severe dust conditions. This inspection should be
made to determine if there has been a rupture of the foam element, damage to the outer screen or end seals, or
blockage of the air flow due to leaves, paper, etc.
2. Cleaning
Remove cartridge and rinse with Stoddard solvent or Avgas. Spray lightly with K&N Air Filter Oil. If any
deterioration in the element is noted, replace with a new Bracket BA-4108 element.
3. Replacement
