On Sun, 30 Nov 2003 16:41:40 -0600, "brucrx"
wrote in Message-Id: :

Is it true that 180F is optimal?

http://www.prime-mover.org/Aviation/...si1094d-3.html
For maximum service live, maintain the following recommended limits
for continuous cruise operation:

(a) Engine Power Setting - 65% of rated or less.

(b) Cylinder head temperatures - 400*F. or below.

(c) Oil temperature - 165*F. - 220*F.