I use Pennzoil Platinum full synthetic in my Z. I first put it in at 3750, did not notice any difference from what it ran like off the lot. Changed it again at about 9,000, I'm at 11,000 now. Car runs perfect, I'm happy to continue using it.
I did a lot of research on different oils before picking one. I think ended up finding the perfect thread by googling BITOG + 370z + Blackstone. Blackstone tests your oil, and this thread had all sorts of factual data of different oil results from this specific engine. Pennzoil Platinum definitely had the best results. Most of the posters there ended up going with it after comparing it with probably 10 other oils such as Mobil1, Nissan's house brand, Redline, Royal Purple, etc...
For what it's worth, Redline did not fare nearly as well in those same Blackstone tests. I was actually planning on going with it (like many others here did) until I found that thread with actual data, as opposed to using everyone's "butt dyno" results.
Having said that...good oil is good oil. I'd put Redline in my Z and not give it a second thought. But Pennzoil Platinum is cheaper (often on sale), available locally, and I have no good reason to consider switching to something else.
One last thing. Pennzoil Platinum does not contain ester. So if that is a concern of yours, look elsewhere. It does not concern me in the least.
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