How to Determine When a Car Needs an Oil Change

1 Answers
McCooper
07/29/25 9:40pm
Methods to determine when a car needs an oil change: 1. Smell Test: Pull out the dipstick and smell it closely. If there is a strong sour odor, it indicates the oil has deteriorated and needs to be changed; 2. Color Test: Take a clean white filter paper, drop a few drops of old oil on it, and wait for the oil to spread. Good-quality oil will have no powder, feel smooth to the touch, and show a clear yellow diffusion zone. If the oil appears dark brown and contains impurities, it needs to be changed. Engine oil, also known as motor lubricant, is composed of base oil and additives. The base oil is the main component of the lubricant, determining its basic properties, and serves to lubricate and reduce friction, assist in cooling, seal against leaks, prevent rust and corrosion, and provide shock absorption for the engine.
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