Quicksilver® Marine Lubricant Performance DFI Oil is recommended for use in Mercury® or Mariner® Optimax® and DFI 2-cycle engines. By combining synthetic additives and a modified base stock blend, Optimax Quicksilver Performance DFI Oil helps minimize carbon build-up, provides increased lubricity and resistance to scuffing, and maintains peak engine performance and fuel economy while helping to reduce smoke. 4L (1.06 gal.). Not intended for use in any engines requiring TC-W3 oil. Ideal for Mercury or Mariner Optimax and DFI 2-cycle engines. Minimizes carbon buildup. Provides increased lubricity. Helps your engine resist scuffing. Maintains peak engine performance and fuel economy. Helps to reduce smoke. 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.