I have a hunch is is talking about replacing the engine oil with kerosene in a running engine to flush out the sludge?
Benzene is gasoline boiling point range.Also wear gloves and a mask since will contains benzene.
As others have confirmed, any type of solvent flush does way more harm than good. One reason is the poor lubricating properties of solvent. Another is the windage tray holds a little over a half of a quart, so it will take several oil changes to get all the solvent back out. And last, there is the consideration of where does all of the sludge go once you clean it off:
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Benzene is a compound not a boiling point;
Benzene is a component of products derived from coal and petroleum and is found in gasoline and other fuels. Benzene is used in the manufacture of plastics, detergents, pesticides, and other chemicals. With exposures from less than five years to more than 30 years, individuals have developed, and died from, leukemia. Long-term exposure may affect bone marrow and blood production. Short-term exposure to high levels of benzene can cause drowsiness, dizziness, unconsciousness, and death.
Benzene is gasoline boiling point range.