As a kid in 70s and junkyard scrounger in the 80s, so many engines had caked charcoal gunk inside that these "engine flush ideas" all fail. Gotta rebuild em.
As for MAINTAINED engines in the 90s+, the oils just get dark to a medium roast coffee color and the flush ideas are interestiong. I'd go for half synthetic.
If boredom kicked-in, i could be moved to fill with kero/diesel/ mineral spirits and run the starter a long bit. As for ignition, idling, driving, i dunno. Beer and whole lotta don't givadarn would have to kick.
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