oil type and oil pump

[kthnos]

anyway, another oil-question here:
bro-science scientists/technicians (in my area) claim that adding 1 cup of diesel fuel inside the engine`s oil compartment/pan, then running the engine for 1 minute and then flushing out the oil (before every oil change) makes a huge difference in engine/passage cleaning-ness.
your opinion on this please? dangerous practice? efficient practice?

any ideas? i usually avoid bro-science at all, but this sounded interesting. should clean up some stuff?