My 2012 has had no oil temp or brake problems. Re break-in, it makes no sense to use synthetic in the first few thousand miles. You WANT the engine to wear a little bit and achieve proper tolerances. Then you can switch to synthetic to preserve the proper state. Overall, I think the break-in is much exaggerated with modern engines. It's not like the old days. They take brand-new cars out and run them on the track--for example, the GT-R. And the engine in the Z is one of the most highly developed, tweaked, and improved engines ever made. So some auto techies complain about high RPM rough sounds? Who cares?
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