Here's a quick overview of Rislone Engine Treatment (p/n 100QR), a bestselling product for 91 years and counting. The formulation has changed as oil technology has advanced, but the results haven't.
Rislone Engine Treatment is a high quality penetrating lubrication oil, combined with protective engine additives and unique cleaning additives. Its multi-grade formula allows the oil to flow freely and provides protection over a broader temperature range. The unique Rislone Formula is designed to penetrate into valve seats, bearing surfaces, piston rings and ring grooves, where deposits are likely to form. These deposits are gradually removed and held in suspension until they are trapped in the filter or removed with the next oil change.