Hi, Calvin --
I went through the exact same dillema when I changed my oil for the first time. (2000 NSXt, 9 months old, now has 4000 miles). Despite my best efforts, I was unable to EVER get an authoritative answer on the suppposed "break in oil". I called three different dealers, including one so called "NSX expert" dealer in California, and I got a different answer every place I called. I even tried the Acura tech line, but got a vague answer about some form of "moly additive" that was in the oil. Bottom line is, the owner's manual doesn't say anything about leaving the factory oil in for a specified period. (BTW, my S2000 owner's manual DOES state that the factory oil should be left in for at least 5000 miles).
Anyway, here's what I did: I put conventional oil in after the first change. When I reach 5000 miles, I will put in my old stand by, Mobil 1 10w-30. I always change the oil after three months regardless of mileage, primarily because I like to put the car up on the jack stands and tinker with it, and the oil change is a good excuse. Also gives me that chance to take off all the wheels and clean the suspension till it shines.
By the way, if anyone has any documented proof of the supposed NSX break in oil, I would sure like to see it.
Mike
[This message has been edited by DeHaldaswerth (edited 03 August 2001).]