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What is Semi-Synthetic Engine Oil?

2 Answers

ConnorLynn

07/28/25 8:06pm

Semi-synthetic engine oil is a blend of mineral oil and fully synthetic oil in a ratio of 4:6. The purity of semi-synthetic oil is close to that of fully synthetic oil, and its cost is slightly higher than mineral oil, making it an ideal transitional product from mineral oil to synthetic oil. The function of engine oil is to lubricate and clean the engine. Engine oil can be divided into: mineral oil, synthetic oil, and semi-synthetic oil. Semi-synthetic oil contains a smaller percentage of high-performance fluids and includes traditional mineral oil. Fully synthetic oil contains 100% non-traditional high-performance fluids. Mineral oil cannot remove impurities during the refining process, has a higher pour point, and is not suitable for use in low-temperature regions.

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KaydenRose

08/12/25 12:55am

I've been driving for over ten years, and semi-synthetic oil is really quite practical. It's a blend of mineral and synthetic oil, more advanced than pure mineral oil with noticeable performance improvements—better lubrication to reduce engine wear, higher temperature resistance to prevent overheating in summer traffic jams. The oil change interval is also longer; I change it every 7,000 to 8,000 kilometers, which is pretty hassle-free. Plus, it's much cheaper than full synthetic oil, making it ideal for daily commuters like me. When I first started using it, I noticed a slight drop in fuel consumption and quieter engine noise. Nowadays, many cars on the market recommend it, especially mid-range vehicles that aren't often pushed to their limits. However, if your car is older or frequently used for long trips, upgrading to full synthetic oil might be wiser. Overall, semi-synthetic oil strikes a good balance between cost and performance—I'm quite satisfied with it and recommend choosing based on the manual or a technician's advice.

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