Majority of engines with problems were in flight training........all maintained by L2 or LAME Self maintained others saw very few problems. Older versions even less
Jetjr, I think you have this backwards. Flying training has a far better record than owner maintained. The private self maintained ones I have seen seldom do 500 hours between major work. The ones in the flying school I worked for regularly reached 1000 hours untouched and were returned to the factory for an exchange in lieu of doing a top end overhaul. Ditto for other flying schools that I know that operate Jabs
Using a Jab engine daily seems to be good for reliability. Ones that sit in hangers for weeks or months at a time don't seem to last many hours. Outdoor storage with infrequent use is a recipe for early failure.