the problem with the 2-stroke diesel/CF-2 spec is that it is now an obsolete spec, which means API doesn't license (or test) those oils anymore (?)
That might be true, but one still could come across some inappropriate lubes. It might take some doing, though. After all, any 15w-40 HDEO you or I find on the shelves is very likely to be dual rated. I'm still wondering why Motorcraft and XOM have those two outliers with respect to gasoline ratings, though.
@DB_Cooper: That TBN might seem a bit low, particularly compared to what we're used to with HDEOs. It's actually not that out of line with a number of products out there, particularly some of the newer HDEOs. It seems that unless a newer HDEO meets an ACEA specification calling for a higher TBN, it's likely going to be in the 7 range. That's really not a problem, though, with ULSD. The guys pushing the OCIs in the diesels will likely be using an ACEA rated synthetic that will have a higher TBN.