What Are the Signs That Engine Oil Needs to Be Replaced?
2 Answers
The signs that engine oil needs to be replaced are: 1. Check the viscosity of the oil; if there is no viscosity, the oil needs to be replaced; 2. The color of the oil turns black; 3. Excessive black particles, metal shavings, or carbon deposits in the oil; 4. The smell of the oil is abnormal. The functions of engine oil are: 1. To separate the surfaces of relatively sliding parts, thereby reducing wear; 2. To carry heat back to the oil tank and then dissipate it into the air, helping the radiator cool the engine; 3. To circulate carbon deposits, sludge, and worn metal particles from engine parts back to the oil tank, flushing away dirt generated on the working surfaces of the parts through the flow of the lubricating oil.
Recently while driving, I've noticed the engine noise is much louder than usual, especially during cold starts when it makes creaking sounds. Checking the dipstick, the oil has turned pitch black with a watery consistency - clear signs it needs changing. Fuel consumption has also increased by about 10% compared to normal, with an unpleasant burnt smell inside the car. Ignoring these symptoms accelerates internal engine wear and may even cause seizure or breakdown. I make it a habit to check the oil monthly - changing it immediately when color darkens or contaminants appear. Following the manual's 5,000km maintenance schedule saves fuel and money while ensuring smooth, safe operation. Regular maintenance can extend a vehicle's lifespan by several years.
