sounds like you took these engines beyond the curve..that moly is the hot ticket for flat tappet engines,I use it in all my small lister petter generator engines it really does a nice job for some extra insurance on startup wear..the listers get 15K hours no problem before teardown(2cyl and 4cyl water cooled diesels) I have been adding to my john deere gen drive engines too..gotta look into getting just the raw moly like you have and dosing it myself instead of the snake oil type plastic containers premixed with oil.