What Are the Types of Motor Oil?
2 Answers
Motor oil can be categorized into conventional mineral oil, semi-synthetic oil, and full synthetic oil. The functions of motor oil include: 1. Separating the surfaces of relatively sliding parts to reduce wear; 2. Carrying heat back to the oil pan and dissipating it into the air to assist the radiator in cooling the engine; 3. Circulating carbon deposits, sludge, and wear particles from engine parts back to the oil pan, flushing away contaminants generated on the working surfaces of parts through the flow of lubricating oil. The method for changing motor oil is as follows: 1. Lift the vehicle with a jack; 2. Drain the old oil; 3. Remove the oil filter; 4. Install a new oil filter and add new oil.
I've been driving for over twenty years and am very familiar with engine oil types. There are three common categories: Mineral oil is derived from petroleum refining, inexpensive but offers average protection and tends to form sludge; Semi-synthetic oil is a blend of mineral and synthetic oils, offering good value for money and is suitable for daily driving; Full synthetic oil is chemically synthesized, providing superior high-temperature protection and extending engine life, making it ideal for high-performance vehicles. When choosing, also consider viscosity grades like 5W-30—the first number indicates cold-weather fluidity, and the second represents high-temperature thickness. For cold winter starts, opt for lower numbers like 0W-20, while hotter climates may require higher numbers like 10W-40. Additionally, API ratings such as SP denote the latest environmental performance standards. It's recommended to change oil annually or every 8,000 kilometers. Using full synthetic oil more often reduces wear and saves money in the long run. Having tried various brands, I find synthetic oil, though pricier, offers better long-term protection and is more cost-effective. Always check your manual for the recommended viscosity grade.