I think it comes down to how hot your Z runs already. As some have said their Z has higher oil temps than others and some run cooler.
Mine on a relatively cool day driving on the freeway at 75-80 runs around 200. On a hot day I run at around 220-225.
When I drove 12-15 miles or so on GMR (glendora mountain road) and was constantly in 2nd/3rd gear with rpms going from 3k-5k most of the time I hit 260 before I even made it to the top and had to take a break to avoid going into limp mode (280).
IMHO my Z runs a bit hotter than it should. I am considering getting an oil cooler myself but each situation is different. I can definitely attest that some Z's can very well go into limp mode and run hotter than they should without an oil cooler even when you don't drive them on the track.
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