I have the Z1 25 row and live in Los Angeles. No problems getting the oil to 180 within about 5 minutes. Not surprisingly, the oil cooler didn't do much in stop and go driving so I had a fan added. That did it.
You may want to consider getting Uprev'd and have the radiator fan start temps changed before you get the cooler.
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2011 Magnetic Black NISMO: Kenwood DDX418, Polk Audio, Dynamat, Z1 25 row oil cooler, 4.08 differential, Stillen G3's
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