Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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Which of the following functions is associated with lubricating oil additives?

To increase the boiling point of oil
To reduce friction and wear on engine parts
To improve the color of the oil
To enhance the viscosity index only

The correct answer is: To reduce friction and wear on engine parts

Lubricating oil additives play a crucial role in enhancing the performance of oils, especially in machinery and engines. One of the primary functions of these additives is to reduce friction and wear on engine parts. By forming a protective film on surfaces, these additives help minimize direct contact between moving parts, thereby decreasing friction. This not only leads to smoother operation but also extends the lifespan of the engine components by reducing the wear that could occur due to metal-on-metal contact. Other functions of lubricating oil additives may include improving thermal stability, preventing oxidation, dispersing impurities, and enhancing the overall performance of the oil in various temperature ranges and conditions. While some additives may influence properties related to boiling point or viscosity, the most significant and directly impactful role relates to friction reduction and minimizing wear, which is why this answer is the most accurate among the options.