Sender: <marv@lancaironline.net> (Marvin Kaye)
To: lml
Date: Fri, 17 May 2002 18:48:06 -0400
Message-ID: <redirect-1240810@logan.com>
From: "Gary Casey" <glcasey@adelphia.net>
Subject: oil temps
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<<I am going to have to do something about my temps.  My oil temps can rise
to 250 on extended climbout, and run about 220 cruising on a hot day.  Can
I use a larger oil cooler?  Anyone else had this problem and solved it?>>

Those temps sound to me just a little bit high, not a lot high.  220
continuous is not a worry - we work with diesel engine builders that design
for 250 continuous under the worst conditions - and their design life is
15,000 hours.  I would not feel comfortable with oil temps that never got
OVER 200 has condensation and acid build-up could be a problem.  Oil temps
over maybe 250 to 275 might shorten the oil life a little as the oil could
oxidize and it will thicken as the light ends are evaporated, but it won't
bother the engine any.  Most people, IMHO, change their aircraft oil so
often oxidation isn't much of a concern.  Use of a synthetic or
semi-synthetic raises the max oil temp more yet.

If I were you I would keep on flying and save the worry about oil temps for
those rainy days with nothing else to do.  Just my opinion, of course.

Gary Casey
ES project