Supersedes Service Bulletin No. 471A
February 20, 2009
Lycoming TIO-541-and TIGO-541 series engines.
TIME OF COMPLIANCE
At initial oil fill and every oil change thereafter.
The additive contains an anti-scuffing agent. Laboratory tests indicate that occasionally when an engine is first started, particularly if the engine has not been used for an extended period, during cold weather, for a very brief interval there is insufficient residual oil between moving parts; this can reduce the service life of components. The additive helps to maintain a film of lubricant to help protect the engine during the initial start-up.
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