The GTR oil is Mobil 1 0W-40. It will not cause harm. It should be cheaper than Nissan Ester Oil (the recommended oil for the 370Z). It will not cause any problems. It will make valve noise slightly louder, which isn't an issue.
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-Phil
"Since one of my brake light bulbs just went out, the forum told me that my piston rings are about to blow."
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