Only engine oil with the American Petroleum Institute (API) Certification Mark -For Gasoline Engines- on the front of the container should be used. This type of oil supercedes the existing API SG, SH, and SJ categories, and the Energy Conserving II category. If an engine oil with the API Certification Mark cannot be found, an oil with the API grade SG/SH, Energy Conserving II, or API grade SJ may be used.
Mercury and Nissan recommend the use of SAE 5W-30 viscosity oil for all temperatures, however, SAE 10W-30 may be used if the ambient temperature is above0°F (-18°C).
The Society of Automotive Engineers (SAE) viscosity rating indicates the oil-s ability to flow at a given temperature. The number designation indicates the viscosity, or -thickness-, of the oil. SAE 5 viscosity oil is a thin and light. It allows the engine to crank easily during cold weather, and provides lubrication quickly to the engine. As engine temperature increases, however, SAE 5 oil becomes too thin to lubricate and protect engine parts effectively. Higher viscosity numbers, such as SAE 50, indicate an oil that is thicker and heavier than SAE 5. SAE 50 provides effective lubrication and protection at normal operating temperature, however, it will not flow quickly enough to provide internal engine protection during cold engine start-up, which is one of the most critical periods for engine lubrication.
Multi-viscosity oils, such as 5W-30 and 10W-30, have the flow characteristics of both the low and high viscosity oils; providing easier engine starting and rapid lubrication in cold weather, and effective engine protection at normal operating temperature.
The 3.0L and 3.3L engines are designed to operate on unleaded gasoline ONLY, and its use is essential for proper operation of the emission control system. The use of unleaded fuel will reduce spark plug fouling, exhaust system corrosion, and engine oil deterioration.
In most parts of the United States, fuel with an octane rating of 87 should be used, unless otherwise specified by the vehicle manufacturer for performance reasons. Using fuels with a lower octane rating may decrease engine performance, increase emissions, and cause persistent heavy knocking which may damage the engine. In addition, always use fuel with an -intake system deposit control- detergent that will help keep the intake valves and injectors clean.
Some fuel suppliers are producing reformulated gasolines which are designed to reduce vehicle emissions. These fuels may contain ethanol, methanol, and MTBE. If reformulated gasoline is used, it should contain no more than 5% methanol, 10% ethanol, or 15% MTBE.