Which of the following is NOT a function of engine oil?

The correct answer is that increasing fuel consumption is not a function of engine oil. Engine oil serves key roles in the operation of an engine, but it is designed to enhance engine efficiency rather than detract from it. The primary functions of engine oil include reducing friction in components such as bearings and gears, which directly contributes to smoother engine operation and better fuel efficiency. In addition, engine oil protects against corrosion of engine parts, helping to extend engine life, and cools by transferring heat away from critical areas of the engine. Increasing fuel consumption would contradict the very purpose of engine oil, which is to ensure that the engine runs efficiently and effectively while minimizing wear and tear.