What is the difference between fully synthetic and semi-synthetic engine oil for vehicles?

[JessicaMarie]

Difference between fully synthetic and semi-synthetic engine oil for vehicles: 1. Different base oils: Fully synthetic oil is a mixture of Group III, IV, and V base oils; semi-synthetic oil uses Group III base oil. 2. Different applicable vehicle conditions: Fully synthetic oil is mostly used under harsh and severe conditions; semi-synthetic oil is mostly used in economical small-displacement vehicles with smooth driving. Engine oil, also known as engine lubricant, is as important as the blood of a car, ensuring the normal operation of the engine. Engine oil has seven major functions in the engine: lubrication, cooling, rust prevention, cleaning, sealing, anti-wear, and shock absorption. Whether the oil level is sufficient and the condition of the oil will directly affect the normal operation of the engine.