What is the difference between fully synthetic oil and semi-synthetic oil?
2 Answers
Fully synthetic oil and semi-synthetic oil differ as follows: 1. Fully synthetic oil has a wider operating temperature range and a longer service life; in terms of oil film requirements, synthetic oil can achieve the effects of higher viscosity semi-synthetic oil with lower viscosity. 2. Semi-synthetic oil is inferior to fully synthetic oil in terms of high-temperature fluidity and viscosity. However, semi-synthetic oil performs slightly better in terms of cleaning properties. Therefore, it is not recommended for performance cars or turbocharged vehicles to use semi-synthetic oil. 3. Using semi-synthetic oil may result in insufficient engine cooling, accelerated component wear, and rapid carbon buildup.
As a car enthusiast, I frequently change engine oil to test performance. Fully synthetic oil is more slippery, heat-resistant, and keeps the engine running smoothly like flying. Especially during long-distance driving, it doesn't thicken easily, providing better protection against wear. In comparison, semi-synthetic oil is a blend of mineral oil and synthetic components, which is cheaper but offers slightly inferior lubrication. It oxidizes more easily under high temperatures, and prolonged use may shorten engine life. I think although fully synthetic oil costs about 100 yuan more, it has a longer oil change interval, such as every 8,000-10,000 kilometers, which is more convenient and reduces waste compared to semi-synthetic oil's 5,000-kilometer interval. Every time I drive, I feel the chassis is stable and acceleration is quick, making it truly worth the price. Modern car engines have high requirements, and fully synthetic oil is more capable of handling demanding conditions.
