What Situations Indicate That Engine Oil Needs to Be Replaced?
2 Answers
Engine oil needs to be replaced under the following circumstances: 1. The oil has deteriorated and has a strong, unusual odor: Pull out the dipstick, and if you can clearly detect an unusual smell with your nose, it indicates that the oil has deteriorated and needs to be replaced promptly. 2. Excessive impurities in the oil indicate that it has reached the end of its service life and needs replacement: Pull out the dipstick, place a few drops of oil on your thumb, and rub it back and forth between your thumb and index finger. Normal oil should feel clean, smooth, and free of particles. If the oil feels sticky or gritty, it means there are impurities present, and it needs to be replaced. 3. The oil has reached the specified maintenance mileage and needs replacement: Refer to the recommended maintenance mileage in the maintenance manual to determine when to change the oil. Additionally, under harsh driving conditions, regularly monitor the condition of the oil.
I've been driving since I was young and have witnessed many oil change scenarios. The first clue that oil needs changing is when the dipstick shows dark, murky oil instead of the clear, transparent appearance of fresh oil; it feels either too thick or too thin, indicating poor lubrication. The engine noise increases, especially with buzzing sounds during cold starts or roaring during acceleration, signaling deteriorated oil quality and insufficient protection. Additionally, adhering to mileage-based changes is crucial—most cars require an oil change every 5,000 to 8,000 kilometers or every six months, depending on driving habits. For instance, frequent short city trips like mine accelerate oil contamination, necessitating more frequent changes. High temperatures speed up oil degradation, so it's essential to check after high-speed driving. Neglecting oil changes not only increases fuel consumption but can also lead to piston ring wear and failure, drastically raising repair costs. Regular maintenance with quality oil, especially synthetic oil which lasts longer, ensures stable vehicle performance and longevity, saving both hassle and money. Don't wait for the warning light—simple habits prevent major failures.
