Last summer, w/o a cooler, I was running about 230 degrees on the highway. The temperature probe was inserted via a spacer in the line to the remote
oil filter.
Installed a cooler over the winter and rerouted the probe to the back of the
oil pan (a baffled Canton). The
oil typically runs about 160 degrees at highway speed. I blocked off the cooler with duct tape and ran it again - no change in temp, (which IMPLIES that a thermostat might not make any difference).
I'm not sure if I'm comparing apples to apples since I changed the location of the temp. probe. Go figure....
With the baffled pan, maybe I'm taking the temp from a 'dead' spot?
Dan