I agree with 2011 Nismo#91 (other than changing the oil vis thing). Most modern motor oils are rated to 300F and the nannies will protect the engine. As long as the temp is spiking only under a hard load with "high" ambient temps, you are OK. Back off for a while and temps should return to normal after a few minutes. If temps don't drop back to normal after 5-10 minutes of "normal" driving (at speeds above 30 mph or so to keep air moving across the radiator), then you may have a problem.
As for changing the oil viscosity, not necessary (at least for a DD). It won't really hurt but won't it won't accomplish much, either. YMMV
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