I've seen all of these work and more on friends/family vehicles. Seen MMO/Seafoam/1qt ATF unstick noisy sticky hyd lifters, sometimes within a couple minutes. Seen 15/40 diesel oil clean things up after a few oil changes using it with surprising results by pulling the valve covers for before/after shots. Heard of people using various amounts of kerosene/diesel fuel but never tried it myself. Me, I've always done all of my maintenance according to the severe maintenance schedule so I never had to use them in the crankcase of my personal vehicles but I had fun experimenting on others.
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