My experience in my 09 was castrol edge. When I purchsed the car it had nissan ester. When I switched to castrol edge, I noticed my temps were lower by about 15 degrees and the engine sounded smoother.
It seems the oil that has been proven by others on here to be the best is royal purple. Some have even claimed hp increases with RP. I will be trying RP for my 2011 when I hit 5k miles. Though I ran mobil 1 in everything except my G37 and Z. I wouldn't recommend it on the Z only because so much conflicting info. Better safe than sorry. From research I like the following three as safe choices;
1. Royal Purple
2. Casrol Edge
3. Nissan Ester- only because its OEM.
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