Supersedes Service Bulletin No. 446D
July 18, 2008
Lycoming O320H, O360E, LO360E, TO360E and LTO360E series engines.
TIME OF COMPLIANCE
At next engine oil change and at every 50 hours and at every oil change thereafter.
Laboratory tests indicate that occasionally when the engine is first started, for a very brief interval there is insufficient residual oil between the rubbing parts which affects the service life of components. Lycoming has evaluated an agent which, when added to the normal oil supply, deters scuffing under these conditions.
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