Quicksilver® Power Tune delivers a premium blend of solvents and oil designed to remove deposits from the combustion chamber. Power Tune softens and removes gum, varnish, and deposits through the fuel system and combustion chambers by the chemical action of this formulation. This internal cleaning helps restore peak performance and efficiency to your motor. Use in 2- and 4-cycle engines. A blend of solvents and oil. Softens and removes deposits from the combustion chamber. Helps restore peak performance. For 2-cycle and 4-cycle engines. Dangerous goods must be shipped via ground transportation to a physical address. This item cannot ship to a PO box or Rural Route. Additional shipping fees may apply. Hazardous Material. Must ship ground only. Not eligible for expedited shipping. Contiguous 48 states only. A physical address is required for delivery. LTD QTY - In the event you wish to return this item, due to regulatory requirements, please contact customer service and we will provide the special shipping label and instructions required for the return of this item.