I would be scared using 5w40 or 5w50 for the car. The viscosity while hot is too much. The rule is simple go lower than recommended never higher.
Recommended by Nissan: 5w30
You can use synthetic:
-5w30
-5w20
-5w10
-0w30
-0w20
-0w10
I would recommend 5w20 though. It's always better to go a tad lower.
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Red 2010 370Z Roadster: Stillen G3, Stillen Exhaust, Up-Rev Tune (312 RWHP), Eibach Pro Springs, 20mm spacers front and back, Rear Camber Kit, Tinted Windows, GT-R Start Button, Interior Mods
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