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Which is Better: Fully Synthetic or Semi-Synthetic Engine Oil?

2 Answers

AngelinaAnn

07/25/25 7:07am

Fully synthetic engine oil is better. Here is an introduction to the differences between semi-synthetic and fully synthetic oils: 1. Source: Semi-synthetic oil is refined from mineral oil using hydro-cracking technology; fully synthetic oil is derived from ethylene or propylene dispersed from crude oil or natural gas, and then undergoes complex chemical reactions such as polymerization and catalysis. 2. Oil quality: Semi-synthetic oil is a semi-synthetic base oil; fully synthetic oil is the highest-grade oil among engine oils. Below is additional information on the functions of engine oil: 1. Lubrication: There is rapid relative sliding between the piston and cylinder, as well as between the main shaft and bearing bush. To prevent excessive wear of parts, an oil film needs to be established between the two sliding surfaces. 2. Auxiliary cooling: Due to its low specific heat value and presence inside the engine, engine oil itself does not have a cooling effect. 3. Cleaning: High-quality engine oil can carry carbon deposits, sludge, and worn metal particles from engine parts back to the oil tank through circulation, washing away dirt generated on the working surfaces of parts via the flow of lubricating oil.

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MacAlaina

08/10/25 6:26pm

To be honest, I think engine oil selection depends on personal driving habits. Having driven for over a decade myself, full synthetic oil offers superior protection and durability, especially ensuring smoother engine starts in winter and preventing cold-start wear. It can last 10,000 to 15,000 kilometers before needing an oil change, which actually saves money in the long run and reduces time spent on maintenance. Semi-synthetic oil is cheaper and suitable for older cars or owners who don't commute much, but it provides less protection and requires changes every 7,000 to 8,000 kilometers—it's not ideal for frequent long-distance or highway driving. Overall, for new engines or those who drive aggressively, full synthetic is the better choice—cost-effective and excellent for engine protection.

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