What effect does high temperature have on lubricant performance?

High temperatures significantly influence lubricant performance, particularly by decreasing viscosity. When a lubricant’s viscosity decreases, it becomes thinner and less viscous, which can compromise its ability to form a protective film between moving parts. This thinning effect means that the lubricant may not effectively separate surfaces, potentially leading to increased wear and tear, overheating, and even equipment failure due to inadequate lubrication.

The relationship between temperature and viscosity is critical; as temperature rises, molecular activity increases, causing the fluid's resistance to flow (viscosity) to decrease. This is particularly important in various mechanical applications where maintaining the proper viscosity is essential for optimal performance and longevity of machinery.

Understanding this relationship helps technicians and engineers select appropriate lubricants designed to perform under specific temperature conditions, ensuring that machinery operates efficiently and is protected against wear.