Overhaul at TBO?

In article , Greg Esres
wrote:

I'm curious as to the overhaul policies at flight schools or rental
outfits. Do they typically do an overhaul at TBO? Our school
supposedly had one that had 5,000 hours, though it had been topped.
Not sure if this was the one that crashed.

I cannot imagine any business spending money unnecessisarily.
With all the interrim inspections and oil changes, the engine should
easily exceed TBO.
That bring up the question of "What is TBO?"
Every mechanic I have talked to tells me that if there is nothing in
the oil that shouldn't be out of limits with oil analysis, and the
compression is good, you can keep on going.
On the other hand, you won't find many competition nor airshow
aerobatic aircraft that go beyond 700 or so hours TT before some kind
of OH is necessary (1200 hr TBO engines). Constant, frequent, short
duration throttle changes, full to idle are the norm in those types of
operations. Except when being flown cross country, contest to contest,
they fly 20 minutes at a contest, 30-45 minutes in practice (how many
and how long can you pull sustained g's?).