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High pitch whistle. Update - AOS??

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I think I know what’s going to be diagnosed here, but I’ll ask anyway. 

Symptoms - high pitched noise that starts once the engine is warms / it does go away in time / it also goes silent when the oils cap is removed.  After the engine is run for a while and is hotter, the rpm will cycle.  And I do have th occasional white smoke.  So I figure AOS but want some other thought  




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