Tony Cox writes:

Actually, the reliability of a properly maintained GA piston
engine is very high.

Then many GA engines must be very poorly maintained, because engine
problems figure prominently in GA accidents.

Where did you get the impression that GA aircraft were
"terribly prone" to engine problems?

From accident reports. When I compare GA reports to commercial
airliner reports, the prominence of engine problems as a contributing
factor in accidents is difficult to ignore.

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