How to Tell When Car Engine Oil Needs to Be Changed
2 Answers
Methods to determine when car engine oil needs to be changed: 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 should be replaced. 2. Rub Test: Rub the old oil between your thumb and forefinger repeatedly. Good-quality oil will feel smooth, have few particles, and no friction. If you feel impurities, poor viscosity, or even a gritty sensation, it should be replaced. 3. Color Test: Place a few drops of old oil on a clean white filter paper. After the oil spreads, high-quality oil will leave no powder, feel dry and smooth to the touch, and have a clear yellow diffusion ring. If the oil appears dark brown with impurities, it should be replaced. 4. Light Test: Hold the dipstick at a 45-degree angle under light and observe the oil droplets. If the droplets are clear with no visible particles, the oil is still good. If there are many particles, the oil should be replaced.
Having driven for decades, I've developed my own set of experiences regarding oil changes. First, check the mileage – most cars need an oil change every 5,000 to 10,000 kilometers, but specifics should refer to the vehicle's maintenance manual. Then comes the dipstick inspection: pop the hood, pull out the dipstick, wipe it clean. Fresh oil is amber-colored; if it turns deep black and sticky like glue, that means excessive impurities and insufficient lubrication – change it immediately. Don’t overlook the oil’s smell either – a burnt odor indicates severe engine overheating or contamination. Once, while driving, I noticed louder engine noise and sluggish acceleration. Upon checking, the oil was pitch black. Delaying the change nearly damaged the engine. Engine oil is like the blood of your car – skipping timely changes increases friction, wears piston rings, and may even lead to breakdowns. My advice: make it a habit to check casually every month – prevention is always safer.
