After doing a little more research, it appears that Nissan holds a patent on the "Nissan Ester Oil" the dealers sell so it may well be that Pennzoil actually does make the oil specifically for Nissan (hence why you can participate in the Pennzoil rebate) and that it isn't a standard Pennzoil product so at this point, I wonder if "Pennzoil Platinum" is the equivalent of the Nissan branded ester oil.
It appears that a basic requirement for an "ester" oil is that it belongs to a "group V" synthetic (and not all synthetics are group V)...whether Pennzoil Platinum is or isn't an ester based synthetic I don't know and haven't been able to find out; even on Pennzoil's website.
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Robert
-My Basset Hound Is Smarter Than Your Honor Student and Barack Obama -
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