On another note, I was at the local Infiniti dealer a few months ago and they were doing a standard tuneup on a P11. The service guy had all kinds of stuff in his hands. Wiper blades, brake fluid, touch up paint, the works. He also had a bottle of Castrol Syntec power system fuel treatment.
I asked him if it works good and he stated it worked great and that they use it on all of the Infiniti's they service.
Kinda contradictory to what I've been told and read on the Nissan sites and se-r.net huh? :-\
If you want your injectors done right just send them to RC. It costs $25 per injector (so $100 for 4) and you get them cleaned, balanced and blue printed. I would do this with any car at 100k and above with stock injectors...