Synthetic motor oil What is the main difference between semi synthetic motor oil and ordinary motor

Hello, the main difference is the lubricity and viscosity of the oil, the fully synthetic oil can provide excellent lubrication for the engine, its high and low temperature, high speed lubrication is very prominent.

Regarding the question of engine oil you consulted, ordinary engine oil is mineral oil, which is a lubricating oil extracted from petroleum, and the base oil of mineral oil is the product of refining the remaining bottom oil left after the fractionation of useful light substances (such as aviation oil, gasoline, etc.) in the refining process. Although mineral oil is cheap, its service life and lubricating properties are inferior to semi-synthetic oils and synthetic oils.

Semi-synthetic oil is the use of semi-synthetic base oil, that is: the international three types of base oil modulated lubricating oil, is the basis of mineral oil after hydrofission technology purification, the purity of semi-synthetic oil is very close to fully synthetic oil, but its cost is slightly higher than mineral oil; It is an ideal transition product from mineral oil to synthetic oil.

Fully synthetic oil is ethylene and propylene dispersed from gas or natural gas in **, and then refined into a lubricating liquid composed of macromolecules through complex chemical reactions such as polymerization and catalysis. The use of the best ingredients, chemical reaction and under artificial control to achieve the expected molecular form, the fully synthetic oil molecules are arranged neatly, the ability to resist external variables is naturally very strong, so the ability of thermal stability, antioxidant reaction, and viscosity change is naturally much stronger than that of mineral oil and semi-synthetic oil.

Regarding the question of what kind of engine oil you use for 30,000 kilometers, I think you can use any engine oil, but the maintenance interval of ordinary engine oil is about 5,000 kilometers, and the maintenance interval of fully synthetic engine oil can reach 10,000 kilometers.

The oil grade is different, the protection of the engine is different, and the fully synthetic engine oil has better protection for the engine.

The main difference is that the quality is different, and the lubrication effect is also different.

The main problem is that their ingredients are different, and their quality is relatively different.

The additives used in motor oil formulations are different.

The size between the oil molecules.

First of all, the production process is completely different, and ordinary engine oil is generally directly collected from the earth's crust; Moreover, the general synthetic engine oil has good fluidity, and is also resistant to high temperatures, and can also withstand high loads, and can also play a particularly good role in protecting the engine.

Fully synthetic engine oil, its temperature is particularly high, and the use time is also very long, and it can better protect some parts, the cost is also very high, but semi-synthetic engine oil it is used for a short time, but its ** is relatively cheaper.

The difference is very big, the power of semi-synthetic engine oil is relatively not particularly sufficient, and the power of fully synthetic engine oil is relatively sufficient, and it is also very durable, and it has also been praised by many users.

I believe that all car owners have heard of the name of synthetic engine oil, and they will often hear the store introduce us to some brands of synthetic engine oil during maintenance in 4S shops. Synthetic motor oil is also divided into semi-synthetic motor oil and fully synthetic motor oil, do you know the difference between the two?

What is synthetic motor oil

In addition to being refined, synthetic motor oil also needs to be distilled, purified, and broken down into basic molecules. It is then reconstructed and improved with additives to provide better anti-wear and high-temperature protection for the engine and prevent sludge formation. In the process of synthetic motor oil, it is not only necessary to remove impurities from the crude oil, but also to adjust the individual molecules in the oil to adapt it to the needs of modern engines.

These tailor-made molecules increase the level of protection and performance, extending the operating life of the engine.

To sum up, the differences between semi-synthetic motor oil and fully synthetic motor oil are as follows:

1. The base oil is differentSemi-synthetic motor oils use Group 3 base oils; Fully synthetic motor oil is made from the use of the first.

Class III, IV and V base oils are blended;

2. The applicable temperature range is differentFully synthetic motor oil is suitable for a wider range of temperatures;

3. Applicable vehicle conditions are differentSemi-synthetic motor oil is suitable for economical cars, while fully synthetic motor oil is more suitable for more demanding high-end models;

4. The cost is differentFully synthetic motor oil is more expensive to manufacture and more expensive;

5. The replacement cycle is differentFully synthetic motor oil is longer.

Compared with semi-synthetic engine oil, fully synthetic engine oil has better high and low temperature performance, a wider range of applicable temperatures, longer service life, better performance, and relatively high cost; The comprehensive performance of semi-synthetic engine oil is lower than that of fully synthetic engine oil, and the cost will be relatively low, but the service life is shorter than that of fully synthetic engine oil, and the number of oil changes is more.

Under the same film requirements, a fully synthetic oil can be achieved with a lower viscosity, while a semi-synthetic oil can be achieved with a higher viscosity than a fully synthetic oil. In other words, in the same working environment, a fully synthetic motor oil can protect the engine with a lower viscosity.

Engine oil is a kind of artificially manufactured engine oil, in the production process, a variety of natural substances are selected for chemical decomposition, and then synthesized with various other substances, and finally the production of synthetic engine oil.

Synthetic engine oil manufacturers produce various types of synthetic engine oil according to user requirements. In other words, synthetic motor oil can change its composition depending on the purpose for which it is used.

Synthetic motor oil is the product of modern chemical technological advancements. The advantages of synthesizers are numerous. For example, synthetic engine oil has higher lubricity than vegetable engine oil, low friction resistance, less oxidation, and strong cleanliness. The disadvantage is that the low-temperature fluidity and heat resistance are worse than those of mineral engine oil.

Semi-synthetic motor oil and fully synthetic motor oil are two classifications of motor oil (fully synthetic motor oil has no mineral oil in it, and semi-synthetic has a little bit of it). The biggest difference between the two is that the fully synthetic oil is used at a wider temperature and has a longer service life; The same oil film requirements can be achieved with a lower viscosity of synthetic oils, while semi-synthetic oils need to use a higher viscosity than synthetic oils to achieve such requirements. In other words, in the same operating environment, a fully synthetic oil can protect the engine with a lower viscosity.

Similarly, in the same working environment, fully synthetic oil has a much longer service life than semi-synthetic oil, so although the cost is higher, it is not much higher than mineral oil after comparing the number of oil changes.

Compared with semi-synthetic engine oil, fully synthetic engine oil has the following characteristics: 1. Fully synthetic engine oil has better high and low temperature performance; 2. There is a longer oil change interval; 3. Suitable for worse vehicle conditions.

Generally speaking, the semi-synthetic engine oil can be used for 8,000 kilometers in vehicles driving in China, and the fully synthetic engine oil can reach more than 10,000 kilometers. If the engine is maintained every three and a half months or 5,000 kilometers, then there is no need to use semi-synthetic and fully synthetic, and only ordinary mineral oil with a quality grade of SJ or above is completely sufficient. Shell Red Heineken oils (quality grades SJ, viscosities 15W-40 and 10W-30) and Mobil Liba oils (viscosities 15W-40 and 10W-30) are recommended.

The difference between fully synthetic engine oil and semi-synthetic engine oil is: 1. The base oil is different: fully synthetic engine oil is used.

Class III, IV and V base oils are blended; Semi-synthetic motor oils use Group 3 base oils; 2. The replacement cycle is different: the fully synthetic engine oil is replaced when it is used for one year or 10,000 kilometers; Semi-synthetic engine oil is changed after half a year or 7,500 km.

3. Different applicable vehicle conditions: fully synthetic engine oil can be used under various harsh conditions; Semi-synthetic motor oil is suitable for models with low economy and low displacement and smooth driving. The role of motor oil is:

1. Alleviate the effect of friction and high temperature to achieve the purpose of reducing wear; 2. Sealing effect, the oil can form a sealing ring between the piston ring and the piston to reduce gas leakage and prevent the entry of pollutants from outside blindness; 3. Anti-rust effect, lubricating oil can absorb on the surface of the parts to prevent the contact between water, air, acid substances and harmful gases and zero-closed orange parts.