Posted for Walter Atkinson <walter@advancedpilot.com>:

Not George, but I'll take a stab at that. I don't think that's what can be
gleaned from his statement. Those 400 million hours were on engines that
were run daily and maintained constantly. If you ran your current engine
DAILY--all day, the same thing would probably apply. We need to change oil
regularly primarily because most of our engines sit for long periods of
inactivity and the buffers in the oil that resist acidity are asked to do
more than they can over that long period of time. Also, those engines used
more oil and the replacement oil was added in relatively large quantities.
If you were adding one to two quarts per flight hour like those engines did
the oil would stay *fresh*. <g>

The point was that the FILTER was a screen that might have stopped a dragon
fly so worrying about our current filter's abilities to do the job seems to
be a nit in the issue.

Walter

On Jul 8, 2007, at 10:00 PM, Chuck Jensen wrote:

George,

Not to put you on the spot, but I will....are you suggesting that (like
cars) we change oil and filters (if we have them) too often? Or at least
more often than necessary?

Chuck Jensen