Steep turn
It is my belief that the quality of Lycoming parts particuarly cams is not as good as it once was, probably because of pressure from the environmentalists as nitriding of parts has become very expensive. Add this to the need to keep costs competitive with the PMA providers and you have the recipe for prenuture component failure.
We have a 1960's vintage Lycoming O-320 that shows no signs of cam shaft failure at each oil analysis, yet far newer engines exhibit problems.
Piperboy84
I will send you the contact details for the oil analysis company we use when I get back into the office after the new year.