Fat Cat Oil is unlike most other valve oils on the market. It is a organic ("dino" oil, as motorcyclists call it) blend in the same viscosity range as Al Cass, Yamaha, Zaja and others. Laboratory tests show that Fat Cat Oil contains far fewer impuritiesthan other oils, since it uses cosmetic grade oils as its base. This contributes to the smooth valve feel and lack of smell. Some valve oils on the market add anti-foaming and wetting agents to their oils. Fat Cat does not dilute its oil with additives.