What is the Difference Between Mineral Oil and Semi-Synthetic Oil?

[ZoeMarie]

Mineral oil and semi-synthetic oil mainly differ in the following aspects: 1. Mineral oil is produced by refining petroleum into base oil and then adding additives; semi-synthetic oil is made by chemically synthesizing base oil and adding additives. 2. Although mineral oil is inexpensive, its service life and lubrication performance are inferior to semi-synthetic and synthetic oils, and it also causes significant environmental pollution. Semi-synthetic oil is a product refined from mineral oil through hydrocracking technology, with purity very close to that of full synthetic oil. Its cost is slightly higher than mineral oil, making it an ideal transitional product from mineral oil to synthetic oil.

[LaGrace]

Mineral engine oil is directly refined from crude oil with minimal processing, making it low-cost and more affordable. However, it contains more impurities and provides insufficient engine protection over long-term use, especially in hot weather where it tends to thin out and oxidize, affecting lubrication performance. Typically, it needs to be changed every 5,000 to 6,000 kilometers. Semi-synthetic oil, on the other hand, is different—it's a blend of mineral and synthetic oils in a certain ratio, with the synthetic portion accounting for about 30%, offering better performance. Since I drive frequently, after switching to semi-synthetic oil, I noticed the engine runs quieter, acceleration feels smoother, and the oil change interval can be extended to over 7,000 to 8,000 kilometers. In the long run, the total cost turns out to be more economical while also reducing the risk of engine issues.

[DeCarmen]

When choosing engine oil, I always consider both economy and practicality. Mineral oil is definitely the cheapest, saving a lot per liter, suitable for daily short trips or older cars, but its performance is unstable in extreme cold or heat. Semi-synthetic oil, with its added synthetic components, maintains viscosity better, reduces engine friction, and slightly lowers fuel consumption. In summer highway driving, semi-synthetic oil controls temperature well, unlike mineral oil which is prone to burning. Semi-synthetic is a bit more expensive, but in the long run, due to extended oil change intervals, the overall cost is more reasonable. If your car is frequently driven, choosing semi-synthetic is more cost-effective.

[Lorelei]

Simply put, mineral oil is a naturally refined oil with high impurities and poor performance; semi-synthetic is a hybrid, blended with synthetic base oil, offering improved lubrication and durability. With mineral oil, you need to change it more frequently, around every 5,000 kilometers; semi-synthetic can last longer, up to over 7,000 kilometers. In terms of price, the former is cheaper, while the latter is slightly more expensive but worth it.