What does the manufacturer's manual recommend for engine oil?

The correct choice emphasizes the importance of the S.A.E. number, which is essential for selecting the appropriate viscosity of engine oil based on temperature conditions. The S.A.E. (Society of Automotive Engineers) number indicates the oil's thickness, influencing how well it flows and lubricates the engine components. Using the correct S.A.E. number is crucial for optimal engine performance and longevity, as it ensures that the oil will provide the necessary protection during various temperatures.

The manufacturer's manual is the authoritative source for this information, detailing not only the recommended oil type but also other vital specifications that relate to the operational efficiency of the engine.

In contrast, the other options address different aspects of vehicle maintenance. The type of fuel is important but does not specifically pertain to engine oil. The maintenance schedule outlines how often various maintenance tasks should be completed but does not specify which oil to use. The cooling method relates to how the engine is kept at a safe operating temperature, which is unrelated to the specific oil viscosity requirements addressed by the S.A.E. number.