Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What role do additives play in lubricating oil?

Improve fuel economy
Reduce engine wear
Increase environmental impact
Hold to a minimum the oxidation of the oil

The correct answer is: Hold to a minimum the oxidation of the oil

Additives in lubricating oil are crucial for enhancing the oil's performance and longevity. One of their primary functions is to minimize oxidation, which is a chemical reaction that can degrade the oil. By hindering oxidation, these additives help maintain the oil's stability and effectiveness, thereby protecting engine components and ensuring consistent performance over time. Oxidation can lead to the formation of sludge and harmful deposits within the engine, so controlling it is vital for prolonging oil life and reducing maintenance issues. While some additives can indeed improve fuel economy and reduce engine wear, the specific focus of the question is on the role of additives in minimizing oxidation. The increase in environmental impact does not typically relate to the primary purpose of additives in lubricating oils; instead, it would be more relevant to the formulation and disposal of these oils.