What's the Difference Between Semi-Synthetic and Full Synthetic Engine Oil?

1 Answers
McSabrina
07/29/25 6:07pm
The differences between semi-synthetic and full synthetic engine oil: 1. Different base oil grades: Semi-synthetic oil uses Group III base oil; Full synthetic oil is made from Group IV base oil with additives. 2. Different replacement intervals: Semi-synthetic oil has shorter change intervals, typically every 8 months or 8,000 km; Full synthetic oil has longer change intervals, usually once a year or every 10,000 km. 3. Different oil performance: Semi-synthetic oil has lower stability and weaker sludge resistance; Full synthetic oil has higher stability and stronger sludge resistance. 4. Different vehicle applications: Semi-synthetic oil is mostly used for economy cars, while full synthetic oil is mainly used for luxury vehicles.
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