What should technicians consider when selecting engine oil?

When selecting engine oil, technicians should prioritize the oil's viscosity ratings and performance classifications. Viscosity ratings indicate the oil's thickness and its ability to flow at various temperatures. This is crucial because oil needs to be thin enough to flow quickly to critical engine parts when it's cold and thick enough to provide lubrication when the engine is hot. The oil's performance classifications reflect its quality and suitability for specific engine types, which is essential for ensuring optimal engine performance and longevity.

For example, if an oil has a viscosity rating of 10W-30, it means that it behaves like a 10 weight oil at low temperatures, allowing for easy starting in cold conditions, while it performs like a 30 weight oil at operating temperatures, providing adequate protection when the engine is hot. Performance classifications, which are determined by standards set by organizations like the American Petroleum Institute (API), help technicians choose oils that meet the engine manufacturer's specifications.

While the weight of the oil pertains to viscosity, it is not as comprehensive as considering both viscosity ratings and performance classifications. The brand and color of the oil, and the temperature at which it burns, although potentially relevant in a different context, do not provide vital data for making informed decisions about engine oil selection. Hence, focusing