One thing to note is the fact that Nissan changed the rear diff recommendation from year-to-year....
Rear Diff: GL 5 80w90
In the 2010:
Rear Diff: 75w-90
The LSD is sealed. No need for a friction modifier, etc.
I imagine most people use the Redline because it is a good oil that gets good results. A slight difference in viscosity shouldn't/doesn't seem to cause any problems.
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