What can excessive temperature lead to in engine lubricants?

Excessive temperature in engine lubricants can lead to degradation and failure of protection. When lubricants are exposed to high temperatures, their chemical structure begins to break down. This breakdown results in the formation of sludge and varnish deposits, which can diminish the lubricant's ability to effectively reduce friction and protect engine components from wear and tear.

As the lubricant degrades, it loses its protective properties, which can result in increased metal-to-metal contact in the engine. This situation can lead to overheating, increased wear, and ultimately catastrophic engine failure. Therefore, maintaining the temperature within an acceptable range is critical to preserving the integrity of engine lubricants and ensuring the long-term performance of the engine.