My
oil temp is consistently lower than my water temp, in general. On occasion they are the same, but not often. When I'm running hard at the track the
oil temp get's up to around 100 c. and the water temp stays around 90 c.
Normal cruising, water temp hangs around 85-90 c with
oil temp less than that. Around town water temp goes up as does oil temp, but not high enough on either side to worry about.
427, iron heads.
I'm not sure I would want an oil cooler, maybe,,, but I've never seen the oil temp get high enough to worry about it. Mostly, I'm happy IF I can get the oil temp UP to equal the water temp. That never happens on a coolish day, only a good warm to hot day.
OH, I'm running about 10 qts of oil, by the way, I think the amount of oil and the location of the temp sensor makes a difference in the reading. My temp sensor is in the front of the pan. I can actually see the temp fluctuate 5 degrees or so, VERY QUICKLY, depending on if I'm accellerating hard, or stopping or moving the oil around in some way. It's like there are pockets of cooler or hotter oil here and there that get moved around and the temp sensor reacts to that real quick? Weird...
Baffled road race pan, my oil pressure never drops even in tight high speed long corners, go figure.