What kind of engine oil is usually provided in manufacturer-sent maintenance?

[JosephineLee]

Manufacturer-sent maintenance usually provides semi-synthetic engine oil. Full synthetic engine oil has low evaporation loss: Synthetic oil is generally a pure compound with a narrow boiling point range, and its evaporation loss is much lower than that of mineral oil, which can reduce fuel consumption, reduce exhaust emissions, and extend the service life of the catalytic converter. In addition, compared with traditional mineral oil-type engine oil, synthetic oil also has excellent chemical stability, good radiation resistance, high oil film strength, and low foam characteristics. Therefore, high-end cars generally choose synthetic oil. Full synthetic engine oil has strong high-temperature oxidation resistance: The thermal oxidation stability of synthetic oil is much better than that of mineral oil-type engine oil, meaning it has a lower tendency to produce acidic substances and sludge due to oxidation. Under various harsh operating conditions, it can provide appropriate lubrication and effective protection for the engine, thus having a longer service life and ensuring the stability of the oil's performance over long-term use. In the same working environment, synthetic oil has a much longer service life than mineral oil, so although the cost is higher, when comparing the number of oil changes, it is not much higher than mineral oil.