oil type and oil pump

[fixkick]

1cup to about a 20:1 ratio, so is small.
i'd not do it, i'd go more freq. oil changes, for a while.... let the great detergents clean the engine naturally.
they sell engine pre cleaners in the store, i think way more radial, kerosene? in it or Stoddard solvents.(close to paint thinner)
those scare me, but if done short time. at idle, nothing like this is harmful.
but id be watching oil pressure like crazy,,, see that it does not drop.
most engines are cleaner, due to better oils that dont sludge up like in old days, with distilled nasty engine oils.