This engine isn't too grand anyway you look at it. It is a great
example
of why one should go to the till once in awhile to get newer parts thru
a factory reman.

Another option: If there's nothing busted, just keep running it.
Check the
spec for oil consumption on the type certificate data sheet. If you
are under
it, you are OK.

You can put a lot of oil in for a cyl overhaul.

I had a 520 that was a quart in three then two for a long time. It was
a pig
but there wasn't really anything wrong with it.

Bill Hale