Got m,y Maximal Performance oil cooler installed... I think a block off plate for winter is a good idea, based on the temps I saw in ~34 degree F. Took quite a while to get warm, and it never really got hot.
http://datazap.me/u/docwalt/10-19-15...ta=1-2-6-11-12
Even in the afternoon at about 50-55 degrees F it took a decent amount of time to heat up.
http://datazap.me/u/docwalt/10-19-15...ta=1-2-6-11-12
Unfortunately I don't have a before and after, so I have no idea how long it would have taken to warm up as stock.