Is the 22 owned by the club or leased back to them?
As someone who leases a machine back to a training organisation I'd sure want to know if oil checks were being ignored by SFHs, students and instructors. It's unlikely to have burnt that much in one day so it shows a systematic failure.
When the engine fails prematurely it's not the flying club that'll have to pick up the tab, but that doen't excuse them from a duty of care.
Get the owner's details off of the CAA website and drop them a line. That'll make the smelly stuff hit the fan!