Rislone 4701 Fuel Injector Cleaner UCL - 6 oz. Rislone Fuel Injector Cleaner UCL maintains optimum efficiency and power with regular use. Smoothes rough idle and eliminates hard starts giving cleaner, quieter operation. Upper cylinder lubricant helps prevent cylinder, ring and piston wear. Saves on gas. Cleans fuel injectors and high fuel costs. Maintains optimum efficiency and power with regular use Smoothes rough idle and eliminates hard starts giving cleaner, quieter operation Upper cylinder lubricant helps prevent cylinder, ring and piston wear Special Shipping Information: This item cannot be returned and has additional shipping restrictions