Which of the following is not a typical reason for lubricant contamination?

High temperature operation is not typically classified as a direct cause of lubricant contamination. Rather, it impacts the properties and effectiveness of the lubricant itself. Extreme temperatures can lead to breakdown or degradation of the lubricant, affecting its viscosity and performance. While high temperatures can create conditions that may lead to contamination (such as oxidation), they do not introduce foreign particles or substances into the lubricant.

In contrast, wear particles from equipment, water intrusion, and dust and dirt exposure are all direct sources of contamination. Wear particles arise from the normal operation of machinery and can enter the lubricant system, compromising its protective qualities. Water intrusion can result from leaks or condensation, which can lead to chemical reactions and promote rust formation. Dust and dirt exposure often occurs in environments where equipment is not adequately sealed or maintained, allowing contaminants to mix with the lubricant and impair its function.