Have you all already read this paper from 2013?: http://www.mdpi.com/2075-4442/1/4/95/pdf
(Nanomaterials in Lubricants: An Industrial Perspective on Current Research)
The text below from page 97 is alarming, in particular if the conclusion also applies to Millers NT motor oils (containing IF-WS2):
"IF-WS2 is marketed as the EP/AW additive for engine oils, gear lubricants and greases , yet its applications so far are very limited. Among the chief limiting factors is the uncertainty about the health safety and environmental (HSE) profile of fullerenes. IF-WS2 also has issues with copper corrosion and poor oxidation stability. As a result, IF-WS2 fortified engine oils are likely to fail the International Lubricants Standardization and Approval Committee (ILSAC) GF-2 Sequence L38 and GF-3 Sequence VIII tests.
Changes in various performance characteristics of a motor oil due to deployment of IF-WS2 in formulation are shown in Figure 2. Modest improvements (outward arrows) in wear protection (for direct-acting valve trains) and fuel economy are outweighed by degradation (inward arrows) in such pivotal properties as corrosion protection, with a specific risk for main bearing corrosion, oxidative thickening, and emission system durability. IF-WS2 doped oils may cause severe damage to engines with Nikasil cylinder bore coatings
, and offer no advantage whatsoever for engines with Alusil bores and roller-follower valve trains."