I am not exagerating, but my ex-Z would hit 260 in the summer time just climbing 405 fwy by Getty. On my side of town, I would hit high temps also around Mulholland Hwy/Decker Canyon Road without being super aggressive. My Z never liked aggressive or slow driving.
BTW, i never went into Limp Mode.

I just realized that I still have my oil cooler kit in the garage. Time for me to hit the 'for sale' section.