I haven't laid eyes on the OEM oil cooler yet but I'm going to agree with Brandon^ Unless you plan on tracking your car, chances are you will not need anything beyond the stock unless you are like me and want to "make damn sure" when it comes to oil temps. If you want to go aftermarket, this is what I would look at:
Z1 Motorsports 370Z/G37 Oil Cooler Kit
The 19 row may not be much more than the OEM kit, might be worth the few extra bones to get the 25 row. Z1 has a good sales staff that can answer any questions you have about your stock cooler vs their cooler. Just give them a call
