Oilers/Plant Tenders Civil Service Exam Practice 2026 – Complete Preparation Guide

The primary role of a lubricating oil in an engine is to reduce friction between moving parts. As the engine operates, various components such as pistons, crankshafts, and camshafts move rapidly against one another. This movement generates heat due to friction, which can lead to wear and tear on the engine over time. By providing a thin layer of lubrication, oil minimizes direct contact between these parts, significantly decreasing friction and thereby protecting the engine against damage.

While lubricating oils do contribute to cooling the engine parts and may have properties that help prevent corrosion and enhance fuel efficiency, their core function revolves around reducing friction. The lower friction provided by lubricating oil not only improves the longevity of engine components but also helps maintain optimal performance.