A local club bought a 2004 P28A Archer 3 from the States, we did a thorough Pre-Buy, cut the filter - no metal. They then had it flown across last June. Due to issues with the Avidyne MFD, the aircraft had to be sent to a specialist avionics shop for repair, in total, the plane did around 8 hours flying in the past 6 months, of which 4 was in the past 4 weeks.
As the aircraft did approx 38 hours crossing, it was decided to do a 50 hour service and metal was found in the filter. On investigation, the hardened part of the cam was gone and it was wearing the followers as well - engine sent for rebuild.
So, if the plane has been sat around for a while and you haven't followed Lycoming's instructions for having engines not regularly run, start the plane, get the oil up to temperature and circulating then afterwards, cut the filter open. If the wear has already started, the trip across could be dangerous.... The cost of a filter against the risk of camshaft wear leading to low power on an SEP atlantic crossing is just not worth the risk.....