Craig,et al
<<If cold starts are not a problem and oil pressure does not get to high and decent oil temp is obtained before take-off, then yes......I am not a fan of changing oil brands or viscosity. I pick something and stay with it. >>

What is a decent oil temperature for take off.  The viscosity changes by roughly 2 orders of magnitude between start up and steady state cruise.  Is there some viscosity/temperature threshold that should be observed to prevent damage at take off power?
Also, is there a particular reason for not mixing brands/viscosity?  I tend to run multi weight in the winter and straight weight the rest of the year(same brand).  There is obviously be some mixing during the change over.
Chris Zavatson