How to check whether the car's engine oil has been changed?

Here's how to check whether your car's engine oil needs to be changed:

1. Judge based on the driving feeling: The performance of engine oil has a shelf life. If you feel lack of power and slow acceleration after driving for a period of time, it means that it is time to change the engine oil.

2. Observe through the oil test paper: Drop a small amount of engine oil on the oil test paper, let it sit overnight, and wait for the oil to completely spread on the test paper. If the edges between the oil ring, sedimentation ring, and diffusion ring are harder, the oil performance will degrade more severely.

3. Judgment by smell: Pull out the oil dipstick and smell it close to your nose. If there is a strong sour smell, it means the engine oil has deteriorated.

4. Observe the texture of the engine oil: Grind the old engine oil with your thumb and index finger repeatedly. If you feel impurities, poor viscosity, or astringency, you should replace it in time. At the same time, it is best to replace the oil filter as well. The function of the oil filter is to intercept impurities in the oil. If not replaced in time, the accumulated impurities will cause blockage.

5. Observe oil droplets: Take out the oil dipstick and hold it up 45 degrees, and observe the oil droplets under light. If there are no wear debris in the oil droplets, it means the oil quality is good. If you see wear debris in the oil droplets, you need to replace it in time.

The above are a few ways to check whether your car's oil needs to be changed. Through these methods, you can easily determine whether the engine oil needs to be changed to ensure the normal operation and maintenance of the car.