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What is the Difference Between Semi-Synthetic and Fully Synthetic Engine Oil?

1 Answers

LenaFitz

07/29/25 1:28pm

The differences between semi-synthetic and fully synthetic engine oil are as follows: 1. Base Oil Difference: Semi-synthetic oil uses Group III base oil, while fully synthetic oil is a blend of Group III, IV, and V base oils. 2. Replacement Interval: Semi-synthetic oil should be replaced every six months or 7,500 kilometers, whereas fully synthetic oil can last up to one year or 10,000 kilometers. 3. Temperature Suitability: Fully synthetic oil has a broader operating temperature range. Under the same conditions, it provides engine protection with lower viscosity compared to semi-synthetic oil, which has higher usage requirements. 4. Vehicle Compatibility: Semi-synthetic oil is more suitable for economical, small-displacement vehicles with smooth driving conditions. Fully synthetic oil performs well under harsh conditions, offering superior high-temperature resistance and low-temperature performance, making it ideal for turbocharged engines and high-end luxury vehicles. 5. Additive Content: Fully synthetic oil contains higher TBN (Total Base Number) additives, extending its service life, while semi-synthetic oil has lower TBN levels, resulting in shorter maintenance intervals. 6. Stability: Premium base oils and advanced additives in fully synthetic oil ensure minimal volatility, greater stability, reduced friction, and consistent viscosity regardless of temperature changes. Semi-synthetic oil, in contrast, has weaker stability.

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