Squawk Box

August 2000 Issue

Oil in the Family

Exxon oil joins short list of oils approved for AD-laden Lycoming design

The following information is derived from the FAA’s Service Difficulty Reports and Aviation Maintenance Alerts. Click here to view "Airworthiness Directives."


The FAA has approved Exxon Aviation Oil Elite 20W-50 for use in Lycoming O-320-H and O-360-E series engines as fulfilling the requirements of AD 80-04-03R2 – making it the third oil approved as an alternative method of compliance.

The AD was aimed at preventing excessive wear and oil contamination due to spalling of the hydraulic lifters. It requires operators to add a Lycoming-approved oil additive at each 50-hour oil change. In 1987, the FAA determined that Aeroshell Oil W...

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