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Is Semi-Synthetic or Fully Synthetic Engine Oil Better for Cars?

1 Answers

LeIsabella

07/28/25 5:45pm

For car maintenance, fully synthetic engine oil is better. Fully synthetic engine oil has the following advantages over semi-synthetic engine oil: 1. Fully synthetic oil offers superior high and low-temperature performance: Fully synthetic oil can operate over a wider temperature range and has a longer service life. It can achieve the required performance with lower viscosity, whereas semi-synthetic oil requires a relatively higher viscosity to meet the same requirements. 2. Longer oil change intervals: Engine oil blended with synthetic oil has stronger oxidation resistance, significantly extending the oil change interval. Although the initial investment in oil is higher, it reduces the frequency of oil and filter changes. 3. Suitable for more demanding driving conditions: Synthetic oil is better suited for higher-load engines, offering stronger resistance to high temperatures and shear. Under high-speed engine operation, the oil does not lose viscosity, providing more comprehensive protection for the engine. Synthetic engine oil is of higher quality and more fuel-efficient.

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