Marine - Motor Oil

Marine oil is specially formulated for marine performance and is endorsed by the National Marine Manufacturers' Association (NMMA). There are two trademarks for marine oil: TC-W3 for two-stroke engines, and FC-W for four-stroke engines. To gain an endorsement from the NMMA, the oil must pass tests for viscosity, lubrication, foaming, and rust, including a 100-hour operational test. Refer to your boat or personal watercraft's owner's manual for the recommended oil type and oil change intervals. At O'Reilly Auto Parts, we carry two- and four-cycle oil for all your marine application needs.