Alright, hope I have some time to put together a reply to answer all questions.
On the actual NT additive Millers uses - it is proprietary. Do I know what it is? Yes. However, I am not an employee of Millers, so while I can give them feedback from my customer base, I have no ability to influence whether or not they'll tell folks what it is. That said, I have to agree with them that keeping it proprietary is advisable, even though it has taken years to determine the right amount with other additives.
As for the interaction of various additives to one another - this is apples and oranges. Or more appropriately, cake to cornbread. The NT isn't just dumped in. It largely replaces conventional friction modifiers. It does so because it doesn't shear down over time, and while others may protect on the "microscopic" level, the NT would be more appropriately described as on the molecular (no pun intended) level.
So how well does it work? Since gear oil is one of the things in question here, here is what it does for coefficient of friction versus load - basic gear oil, gear oil + conventional moly EP additive, and basic gear oil with NT instead:
Okay, so it reduces coefficient of friction. What about load bearing capability? Here are a couple of SRV Oscillation tests (I believe it is ASTM D5706):
Baseline w/ conventional additive:
With NT additive ILO conventional:
As you can see from the above, the non-NT version with conventional EP additive fails shorty before the load increase from 1100N to 1200N. That is the green line. This compares to a failure slightly after the load increased to 1600N on the NT version. The red line is the CF, so even before the failure, you can see the (qualitatively) better performance of the NT version.
Another benefit on the gear oils is heat rejection. Millers has been working with some F1 teams wiht the technology, which ones are confidential (though there is a formal technical partnership with Bryan Herta Autosports). Measured heat rejection difference for the first generation was on the order of 500 Watts. It is now larger. Measurement taken from a water bath used to heat gearbox oil on powertrain dyno testing sessions. It takes 500W more power to get the right temperatures with the NT oil. Typical race cars without large external coolers (which confound the system) see 10-15C drops in operating temperatures. Race Tech Magazine had a good article about it that goes into some of the mechanics: This is a PDF of the article
Race Tech: Tiny Technology, Big Breakthrough FWIW, the gear oil also beat out McLaren and Williams for
Most Innovative New Product in Motorsports in 2009.
To get to the "transmission" versus "gear" oil difference, Millers does have a transmission oil with the technology,
http://performanceracingoils.com/ee-transmission-75w90-oil-p-87.html. It is the street version of the race oil. There is a philosophy that Millers has pertaining to viscometrics that likely leads to the high kinematic viscosity at 40C that I believe is the cause of concern. Since VII's break down, Millers avoids them in their race oils as much as they can. That helps the race oils last much, much longer than many of our competitors who have higher VI's. I know this is the case for the engine oils, and I assume it is the case for gear oils, as well. Since the cold viscosity for a race oil isn't nearly as important as the performance at operating temperatures, sacrifices are made to ensure robustness at the higher temps. For a street oil, obviously things will be different. This may be what is being sought.
I thought I had read somewhere that someone had not been able to find a credible source for the performance of the oil. What I've posted was done internally, but I can provide more links to technical articles, SAE International, Race Tech Magazine, Race Engine Technology, Lube Magazine...... I can actually give a Fast Ford article, as well, but I don't put those kinds of publications up there wth the more engineering ones. There is also one from Cup Race Technology from earlier this year, but they will not give me permission to publish it.
Do y'all want me to provide any similar info on the engine oils?