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Pick a nice warm dry week end and drop the pan. Pull the valve covers. I think you will find the culprit with some careful observation and close attention Good luck. Let us know your results. We are all going there some day !

Good observations Frank ! I probably put in the region of 50 hours a year on mine . Sample interval on a average Fighter is 10 hours , ten hours of flight time pulling gs and twisting into every contortion known

Don’t for get timing assy oil pump ect

The soap results would say. Mild steel FE cast iron , And perhaps some copper CU and Babit ( mains) ( big end little end for miki ) precursors Clevite . If it was used in the rings for example. All General wear metals present in any engine of that era. Problem is with out established...

Your spot on miki

A spectrometric oil analysis is only as good as the base line data, anybody have the wear metals formulation for a multifuel ? I could be wrong but i don't remember seeing one in the tech data, Judging by the age I doubt the Army ever paid the manufacturer for one , If there isn't one your no...