Why is high heat detrimental for oil?

High heat is detrimental for oil primarily because it causes oil to oxidize. When oil is subjected to elevated temperatures, the chemical structure of the oil can break down, leading to increased formation of sludge, varnish, and other harmful byproducts. This oxidation not only diminishes the oil's lubricating properties but can also lead to the formation of acids, which can corrode engine components and reduce the overall effectiveness of the lubrication system.

While it may seem intuitive that high heat could thin the oil and allow moving parts to come into contact, this simplification overlooks the complex interactions between heat, oil properties, and engine function. In reality, extreme heat can lead to the oil becoming less effective at maintaining a protective film between moving parts, which increases wear and the likelihood of mechanical failure.

Thus, understanding the process of oxidation as a result of high temperatures helps clarify why maintaining appropriate operating temperatures is crucial for the longevity and performance of lubricants within gas turbine systems and other mechanical applications.