Why do I put Microlon in the fuel?

Unlike oil additives, Microlon is a metal treatment. Microlon is compatible with gasoline, diesel and oil. The fluids in the engine are used only to carry the Microlon resin to all of the bearing surfaces reached by those fluids. The Microlon added to the fuel treats the top end of the engine, while the Microlon added to the crankcase treats the rest of the engine.