What are the methods to identify when to change engine oil?
3 Answers
Methods to identify when to change engine oil are: 1. Smell test: Pull out the dipstick and smell it closely. If there is a strong sour odor, it indicates the oil has deteriorated and needs to be changed; 2. Finger rub method: Rub the extracted old oil between your thumb and index finger repeatedly. If you feel impurities, poor viscosity, or even a gritty sensation, it needs to be changed; 3. Color identification method: Take a clean white filter paper, drop a few drops of old oil on it, and after the oil seeps through, if it appears deep blackish-brown with impurities, it needs to be changed. 4. Light inspection method: Pull out the dipstick and hold it at a 45-degree angle, observing the oil droplets under light. If there are many wear particles, it needs to be changed.
I've been driving for over a decade and often change the oil myself. The simplest way to check is by pulling out the dipstick to observe the color. Fresh oil is transparent golden-yellow; if it's black like ink and sticky, it definitely needs changing. Don't ignore the mileage either—generally, you should change it every 7,000 to 10,000 kilometers, otherwise, the engine noise will increase. I've even experienced a situation where not changing it on time caused the car to break down halfway, costing a lot more money. Regular checks can extend the engine's lifespan and save you headaches. Remember, don't just go by the time interval; consider your actual driving habits.
As an average car owner, I find it quite easy to determine when to change the engine oil: just check the dipstick every time after refueling. Fresh oil has a shiny golden color, while used oil turns dark and black. If you detect a burnt smell upon closer inspection or notice tiny impurities floating in it, those are clear warning signs! According to the maintenance manual recommendations, it's best to change the oil every 6 months or approximately 5,000 kilometers—this protects your vehicle and prevents minor issues from escalating. Before changing, always check the oil can specifications to ensure you're using the correct oil grade.
