MMO is your friend. Add 1 qt to the crankcase and run the engine. We used to do this all the time when aircraft recip engine would have low cylinder pressure but no other indications of other mechanical maladies. in most cases the compression would come up enough to put off a top overhaul for a few more hours.
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“It takes considerable knowledge just to realize the extent of your own ignorance.”
Dr. Thomas Sowell
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