How can you identify fuel contamination in engine oil?

Identifying fuel contamination in engine oil can be effectively done by recognizing a strong fuel odor or noting abnormal oil viscosity. When fuel contaminates the oil, it can significantly alter the oil's characteristics. The presence of fuel can lead to a noticeable odor and can thin the oil, resulting in decreased viscosity. This reduced viscosity might affect the oil's ability to lubricate and protect engine components efficiently, leading to increased wear or potential engine damage if not addressed.

The other options do not accurately indicate fuel contamination. Excessive oil pressure typically points to issues like oil flow restrictions or a malfunctioning oil pressure relief valve rather than fuel presence. A decrease in oil temperature can result from various factors like a malfunctioning thermostat or cooling system issues, but it does not relate directly to fuel contamination. Finally, the color of the engine coolant is more relevant to potential coolant leaks or other cooling system issues, not fuel contamination in engine oil. Thus, the strongest indicators of fuel in the oil are the distinct fuel odor and changes in oil viscosity.