Regarding the oil issue, i have seen coolant collar style oil cooler on the G37, but haven't seen one on the 370Z, regardless of trim.
As far as comparing the two cars, night and day difference. I loved the look of the G when it came out, and the specs on it, but when i drove it, i pretty much hated it. Car felt two sloppy in the corners, and just overall heavy. The Z feels so nimble in comparison its unbelievable.
The Z also has some added chassis stiffening and braces that the G doesn't have, which may not be noticeable when new, after a few miles (especially w/ upgrades springs/shocks) will probably become more apparent. The Z has the rear braces that you will notice in a lot of the exhaust pictures, as well as the same "W" shaped brace that the Z33 chassis had, as well as a couple of braces in front of the front doors that connect the front sub frame to the body.
Really it comes down to if you want a sports car or a GT car.
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