"Robert M. Gary" wrote:

I'm sure the shop is doing it but I do most of the oil changes myself
(except the one at annual). I'm not checking the screen.

I check mine every other oil change, whether I've run up 50 hours or not. My engine
is an O-320. On that, the screen looks like a horizontal drain plug on the sump.
Safety-wired, of course.

George Patterson
None of us is as dumb as all of us.