Increased demands are put on the lubricants used in an OptiMax engine. (An OptiMax engine is direct-injected as opposed to carbureted or electronic fuel-injected). To keep pace, the manufacturer recommends OptiMax oil.
You can buy individual containers or you can save some money and purchase bulk Mercury OptiMax oil. The oil has additional additives that provide an extra layer of protection. By using the oil, which can be mixed with Mercury Premium Plus, your engine will maintain peak engine performance for many uses.