Snap-on’s new specialty funnel, for certain Honda, Acura, Nissan, Dodge Cummins, and Ford Diesel vehicles, features threads so you can screw it into the oil filler inlet. They advertise the funnel as one you “fill with oil and walk away from” — if you’re willing to pay through the nose for it.
The Snap-on funnel sells for $30, so you’d need to perform quite a few oil changes to make this one pay for itself. As a shadetree mechanic I can just wait the 30 seconds.
Threaded Oil Filler (PDF) [Snap-on]