With everyone criticizing Lycoming and Continental, I will point out a
couple of items. I have Lycoming 1996 0-360 in my Husky. Since NEW, it
has 2200 tach time (about 2600 Hobbs). No oil usage, no metal in the
filter, oil analysis is good and makes above 70 on the compression.
Goes as fast and climbs as well as when new. Engine has never had any
engine components serviced. (accessories like alternator, yes).

I know of a certain government aircraft (two actually), Cessna 185's
that have AWAYS made TBO. They automatically replace the engine at TBO
with Continental factory rebuilt. They have gone through 6 engines
over the years, and EVERY engine has made TBO without cylinder
replacments. The 185 engines are notorious for cracked cylinders.

Then I hear of rebuilt engines from whoever, cracked cylinders,
rebuilt cylinders etc. But the above are factory Lycoming and factory
Continental. All stock factory components. And they did just fine.