How to Determine if Engine Oil Needs to Be Changed

1 Answers
AlejandroRose
07/29/25 5:41pm
Methods to determine if engine oil needs to be changed: 1. Observe with an oil test paper. Take a small amount of oil from the dipstick and drip it onto the oil test paper, then let it sit overnight, waiting for the oil to fully spread on the paper. If the edges between the oil ring, sediment ring, and diffusion ring are harder, the more the oil performance has degraded. 2. Judge based on driving feel after an oil change. Engine oil has a 'shelf life' in terms of performance. If you feel a lack of power in the car or slower acceleration during a certain period, it indicates that the oil needs to be changed. Additionally, if you notice a significant improvement in power after an oil change, it suggests that the previous oil change interval was a bit too long. Next time, you can consider changing the oil 500 kilometers earlier, gradually finding a more accurate oil change interval.
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