I only use Nissan's Ester oil... I notice THE lowest temps with my car, I only hit past 220 once in Texas on a 100 degree day... (Without the oil cooler)
That's most likely what your car was broken in with too...
Make sure you oil levels are correct too... half a quart short (about half way between E and F or whatever on the dipstick) is about 10% of the oil the car holds, and theoretically would make your temps go up 10%
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