Both Continental Engines and Lycoming Engines recommend similar processes of engine preservation oils for aircraft that are grounded for more than 30 days.
These service letters both reference an engine oil conforming to MIL-C-6529C Type II, and while AeroShell Fluid 2F has been withdrawn, AeroShell do still manufacture and supply the two oils that made up this fluid:
AeroShell Grease 22 is a versatile, multipurpose grease designed to extend the lives of wheel bearings operating under high loads, speeds and temperature ranges. This grease can help to extend component life and reduce maintenance costs through its excellent load-carrying capacity and resistance to wear, corrosion, oxidation and water washout.
During storage and aircraft down time, AeroShell Grease 22 continues to keep aircraft wheel bearings, engine accessories, control systems, actuators, screw jacks, servomechanisms, electric motors, instruments, airframe lubrication, hinge pins, static joints and landing gear free from corrosion and ready to fly.
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