I'll throw my two cents in on this right quick even though it is a slightly old topic it may help others.
First. The stock 12+ MY oil cooler works fine. I have beaten my 370 down and even in summer temps it never went past 230.
Second. And I've spoken with the dealer regarding a retro-fit of the stock oil cooler assembly on a pre-12 MY 370 and the cost was pushing $900 just for parts. And the complexity of installing it is a bit over the top since you would need to drop the motor. Yes. You need to drop the motor.
Third. I had a 25R GTM oil cooler installed on top of the stock oil cooler and ran into over-cooling issues. It was subsequently removed within two weeks. Oil temps are back to ideal. (The needle on the dash isn't exactly what your oil temps really are but we should all know this by now)
Not to mention the holes you get to cut and the minor modifications to the mount to fit the cooler, rubbing issues with lines, extra hardware to fall apart on you. And the best part? If this thing fails and your motor goes you get to foot the bill on a replacement motor if it is under warranty.
Given that little tidbit... Why even bother with it? If it is under warranty and you don't go into limp mode (as you shouldn't), why try to overdo it? It is a waste of money and in the end can be more detrimental by causing sludge formation due to moisture in the oil not burning off because it isn't getting hot enough.
Anyhow... Those are my thoughts after having been through this already. Take it or leave it. Good luck!
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