Four questions..

What weight of Oil?

What brand?

How long before the oil pressure came up?

How long since last run?

Preferred answers.

15/50, Aeroshell,less than 15 seconds, less than one week..

4 of 4.. no concern

1, 3 and 4 ...probably no concern

1 and 3, - might see aluminum spike a little in your next oil test

Single weight, brand "X", more than 15 seconds, more than 3 weeks..
Probably should not do this very often...

The above gleaned from others much more capable than I, and I chose
to listen when they speak..

YMMV!

Dave



On Wed, 19 Dec 2007 12:21:28 -0500, "Peter R."
wrote:

This time of year here in the Northeast US I always preheat my Bonanza's
IO520 engine with a Tanis heater and an insulated cowling/prop cover as it
sits in an unheated t-hangar. The result is that the oil temperature at
startup is around 105 degrees F, even if the outside air temperature is as
low as -15 degrees F.

Monday night I arrived at my t-hangar to discover that at some point during