Can Engine Oil Be Completely Drained During an Oil Change?

[VonJulian]

It cannot be completely drained. Using an oil extractor removes more oil than loosening the drain plug. The extractor uses compressed air to remove approximately 80% of the old oil, while loosening the drain plug relies on gravity to drain the oil. Some small oil passages and channels cannot be fully emptied by gravity alone. Therefore, using an oil extractor results in a cleaner oil change compared to the drain plug method. Below are some precautions for changing engine oil: 1. Drain the oil when it's hot for better fluidity. 2. Fill the oil to the level indicated on the dipstick. 3. Choose the oil change interval based on vehicle condition, road conditions, oil quality, and driving habits. 4. Select oil based on driving environment, driving frequency, and the requirements of the vehicle's engine, opting for higher quality when in doubt.