We have had over 35 consecutive days of 100+ temperatures in Texas (record is 42 set in 1980) and my 370z is a DD and I have never seen my temps over 240 even with spirited driving thrown in the mix. My temps usually hover around 220 in this god awful heat so, some of you guys must be pushing your car pretty hard on the streets if you are reaching 240+ in 80-90 degree temperatures. Anyway, from what I experience everyday I wouldn't think an oil cooler is necessary unless it is a dedicated track car or you have money to blow.
Side note: I am begging for 80-90 degrees here, at night(9pm-12am) our temps range from 95-100 STILL!)
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2010 MB 370Z 6MT
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