So in May 2019 I installed a batch of the new Motorcraft 5w50 that comes in the new bottles with the big screw tops. It pours a lot faster and I'm sure the dealerships love it. Anyway, I figured if the engine blew up during a driving event this summer, it was best to be on Motorcraft. About the beginning of August, I decided to run this oil right to the end of the Oil Life Monitor. A small drip from the drain plug ended this dream at 11% left to go, but it was pretty much used up. The oil was dark and looked pretty nasty, although a bit of kitchen sink chromatography had indicated that all was well (a blotter test). So here's the UOA result: Motorcraft oil gets a lot of hate for being the OEM product, but frankly this oil is doing an excellent job in my GT350. It takes a huge online beating for shearing down to a 40 weight, but mine is just barely under the 16.3 limit for a 50 weight. TBN and nitration are excellent - Blackstone doesn't measure nitration, and that's one of the reasons I like CAT labs. Nitration is an important measure for a gas engine because it's an indication of combustion efficiency and the likelihood that the oil will form varnish. Under 10 is excellent. Wear metals, a highly over-rated indicator, are good too, although that doesn't mean much on a single analysis result. The only question after a result like this "why would anyone use anything else?"