Mixed views on moly slip being counter-productive. However, it does smooth the gearbox slightly, especially from cold. I'm not really clued up enough to comment on how exactly it works, so can't really comment on that. As for the gearbox oil, I'm not sure. Yes, the Nissan oil is only a specifically graded oil with a Nissan label on, however I would appreciate if the people who are saying this could advise on what branded oils are exactly the same oil as the Nissan oil. And maybe a trader like opie oils could explain this?
But being that Clark Motorsport, Zmanalex, and CS recommend only Nissan fluids when the could flog something else with (probably) a higher margin, says it all really. And people may disagree with my logic, but it's my logic, it works and is risk free. If someone provides a bit more that 'it is only a label', perhaps I would re-evaluate. Not wanting a big debate here, but this is my trail of thought.