I use engine oil after cleaning everything with multiple products.
Like the illustration above - different solvents (soap & water, thinner, WD40, ATF) all seem to remove different stuff.
I just get a thin film of oil on rings, cylinder walls, and skirts.
No exotic powders or elixers.
Figure that the engine will live on oil for the rest of it's life after the first couple of seconds.
Top ring is probably lubricated by fuel as much as by oil...