300 Degree Oil Temps!

[Piledriver]

I'm going to guess lower back pressure

[4agedub]

I think just the sheer surface area makes a difference. The setrab cooler is around 1" thick where the intercooler is around 2" thick.

[jhoefer]

Core depth will make a difference, there's also most likely more internal surface area per inch than what's in an oil cooler, plus an intercooler's walls are thinner allowing faster thermal transfer between oil and air. Of course that last one is why you could only use it on the tank return side, not the pressure side, otherwise it would burst.

[4agedub]

You are quite right, this cooler setup can only be used on a low pressure line.