I'm also in AZ and I have installed a 25 row oil cooler. I don't have any issuses. It takes alot of spirited drive just to get it over 220. The 2012 and newer do have a oil cooler in them but it is a water cooler transfer. I have heard that it is not as good as a true oil cooler but it does still help. Anywhere else in the country I would say a oil cooler is not needed unless tracking the car but AZ I would suggest one. It may not be absolutely nessary but why chance it. Limp mode sucks and 120 degree weather stuck on the side of the road sucks. There is definatly a fix to the issue.
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