Looks like the Castrol EDGE 0W-40 did really well, considering that all these lubes ran in a GDI Twin Turbo V6 engine that shears oils pretty badly. Shame for the RedLine though.
@HEMIMANN said a while ago, and I quote:
There's no more hot stable oil than Red Line.
I beg to differ, as RedLine sheared beyond belief for such an expensive oil. Looking at that 405F flashpoint, the searing is due to heat, not fuel dilution. Out of all the oils used in the engine shown in the UOA above, Castrol EDGE Euro 0W-40 performed the best. At $21.99 for a 5-quart jug, and considering that it's full of Organic Friction Reducers, it's hard to beat. In Castrol EDGE Euro 0W-40, a Titanium-based additive takes the place of the Molybdenum for boundary lubrication situations where Moly would be used otherwise. Castrol does this to lower the spASH of their oil to 1.1%.
Friction Modifiers:
Article on OMFs: https://pubs.rsc.org/en/content/art...ves have,substrates in a tribological contact
Wikipedia: https://en.wikipedia.org/wiki/Friction_modifier
Molybdenum doesn't coat anything, as @Burla theorized. Organic Friction Modifiers do: OFMs are amphiphilic surfactants, such as fatty acids, often derived from fats and vegetable oils. OFMs are important additives in modern engine oils and are also employed in fuels. They adsorb on metal surfaces and self-assemble to form incompressible monolayers which prevent asperity contact and reduce friction and wear.