How to Determine if Engine Oil Needs to be Changed
2 Answers
Methods to determine if engine oil needs to be changed are as follows: 1. Observe with oil test paper: Purchase oil test paper, a slow qualitative test paper with a diameter of 9-11CM will suffice. Drop a drop of engine oil onto it and leave it overnight, then check the condition the next day. If the edges between the diffused oil ring, sediment ring, and diffusion ring are harder, it indicates more severe degradation of the oil's performance. At this point, the engine oil needs to be changed. 2. Change engine oil based on driving feel: Engine oil performance has a shelf life. If you notice slower acceleration while driving for a period of time, it indicates the need for an oil change. If a significant improvement in power is observed after changing the oil, it means the previous oil change interval was too long. Next time, you can appropriately advance the oil change by 500 kilometers. After 1-2 times, you can find a more accurate mileage interval for oil changes.
To determine if engine oil needs changing, I primarily observe its color and viscosity. After turning off the engine and letting it cool for ten minutes, pull out the dipstick, wipe it clean, reinsert it, then pull it out again to inspect. If the oil appears dark black or brown instead of the clear yellowish hue of fresh oil, feels overly thick, or shows floating impurities, these are signs of degradation; a burnt smell also indicates it's time for a change. Mileage is equally crucial—I typically change the oil every 5,000 to 10,000 miles, tracking intervals with a mobile app. Don’t overlook time either; replace it every six months to prevent oxidation. If you notice increased engine noise or a sudden spike in fuel consumption while driving, worn-out oil is often the culprit. Conduct monthly self-checks, especially after long trips, to avoid costly overhauls, extend your car’s lifespan, and save money with peace of mind.
