How to Determine When Car Engine Oil Needs Replacement?

[CourtneyLynn]

Methods to determine when car engine oil needs replacement are: 1. After pulling out the oil dipstick, smell it closely. If there is a strong sour odor, it indicates the oil has deteriorated; 2. Rub the extracted old oil repeatedly between your thumb and index finger. If you feel impurities, poor viscosity, or a gritty sensation, it should be replaced promptly; 3. Hold the oil dipstick at a 45-degree angle under light and observe the oil drops. If you can clearly see no wear debris in the drops, the oil is in good condition; 4. Take a clean white filter paper, drip a few drops of old oil on it. After the oil seeps through, high-quality oil will leave no powder residue. Precautions for changing car engine oil are: 1. Perform the change when the engine is warm to ensure the old oil is drained as completely as possible; 2. Add new oil and ensure the amount is appropriate; 3. After adding the oil, start the engine and check all components for leaks. Run the engine for 3 minutes to confirm the oil level is at the normal mark.