What does a higher engine oil grade number indicate about the viscosity?

A higher engine oil grade number indicates stronger viscosity, which means that the oil will be thicker and provide better lubrication under higher temperatures and loads. Viscosity refers to the oil's resistance to flow, and it is measured using a numerical grading system. The higher the grade number, the more viscous the oil is, allowing it to maintain its protective properties under extreme conditions, such as high engine temperatures.

This is crucial for ensuring optimal engine performance and longevity, as a higher viscosity oil can provide better protection against wear and tear, especially in high-stress scenarios. Lower viscosity oils are typically thinner and may not perform as well under intense heat or pressure. Moreover, increased flammability and faster breakdown are not characteristics associated with higher viscosity; rather, they are concerns typically linked to improper oil selection or degradation of oil over time.