Which is better semi synthetic motor oil, and how much cheaper is it than fully synthetic?

What your friend said is not unreasonable, mainly because the domestic market is too chaotic, and many semi-synthetic engine oils have been upgraded to fully synthetic engine oil, which is sold according to the standard of full synthesis, but in fact, the performance is not up to standard. However, changing to a qualified fully synthetic engine oil is definitely better than semi-synthetic engine oil. Semi-synthetic engine oil is not particularly good, cheap can be two or three hundred dollars cheaper, but you might as well be good fully synthetic.

Because I change the GT engine oil myself, PAO's full synthesis, I can calculate the maintenance cycle by 15,000 kilometers, if I change the general semi-synthetic engine oil, it is at most 5,000 kilometers to change it, and the cost performance is different.

1.Drive the vehicle into a position, pull the parking brake, and use a lift to support the vehicle;

2.Lay out the fender pads and three-piece set, unscrew the engine oil cap and lift the vehicle to the appropriate height;

3.Remove the drain bolts of the lower guard plate and oil pan and drain the engine oil into the oil connector;

4.After the discharge is completed, wipe the oil drain plug and replace the new bolt gasket, and tighten it according to the torque in the maintenance manual;

5.Use the engine oil filter wrench to remove the engine oil filter;

6.Install the filter (screw the new filter on the filter base by hand until the filter is fully integrated with the filter base, and tighten it 3 or 4 times with a filter wrench after the filter is fully combined with the base).

7.After filling the engine lubricating oil, start the vehicle to detect whether there is oil leakage, turn off the engine and wait for 3min to check the oil level scale of the oil dipstick;

8.The engine is tested on the vehicle, the oil pan bolts and the engine oil filter are checked again for leaks, and the lower guard is finally installed.

PS: Pay attention to the hot car and drain the oil.

Here are the steps to change the oil maintenance.

The main differences between semi-synthetic and fully synthetic motor oils are as follows:

1. The base oil used is different;

2. The replacement cycle is different, and the oil change cycle of semi-synthetic engine oil is shorter than that of fully synthetic engine oil;

3. The content of additives TBN is different, with more fully synthetic engine oil and less semi-synthetic engine oil;

4. The anti-aging stability of fully synthetic engine oil is better;

5. Fully synthetic engine oil can better protect the engine;

6. The ** of fully synthetic engine oil is higher than that of semi-synthetic engine oil.

Not all of them are correct, but the fully synthetic factor is "round and uniform", and the movement inside the engine better protects the mechanical parts inside the engine.

Semi-synthetic is part of the "round uniform", part of the "square with water chestnut", the internal movement of the engine to protect the internal mechanical parts of the engine is not as good as the full synthetic engine oil, but this wear is long-term can be seen.

Then there is the oil change cycle, which is generally a change in kilometers in semi-synthesis, and a change in 1w kilometers in full synthesis.

It is calculated according to the full synthesis of 260 yuan and the semi-synthetic of 190 yuan. Oil filter 38, man-hour cost 38.

The cost of full synthesis is 336 yuan for 10,000 kilometers.

The cost of semi-synthetic is about 355 yuan for 10,000 kilometers.

At this point, the question arises, why is semi-synthetic more expensive than fully synthetic? Because it costs money to change the oil and oil filter.

I've always used fully synthetic engine oil, every 10,000 kilometers.

The cost of full synthesis is low, and the oil change interval is long, and the protection of the car is also better than that of semi-synthesis, saving time and worry.

Then there is another obvious difference between semi-synthesis and full synthesis, that is, the sound of the engine, it can be heard that full synthesis is quieter.

It is recommended to use the SN grade of fully synthetic motor oil corresponding to the car maintenance manual.

Fully synthetic motor oil has better high and low temperature performance. Fully synthetic oils are used at a wider temperature and have 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 working environment, fully synthetic oils can protect the engine with a lower viscosity.

Semi-synthetic engine oil has better lubrication performance than mineral oil, longer oil change interval, ** and will not be much more expensive, it is a mineral base oil with higher purity, and then add additives to a mixed product, cost-effective, 7000 kilometers of oil change cycle. Fully synthetic oil is used at a wider temperature and range, and the replacement period is longer, reaching more than 10,000 kilometers. With the improvement of engine oil technology in recent years, synthetic oil can achieve the same oil film strength with lower viscosity with the same oil film requirements, while semi-synthetic and mineral engine oil need to use a "more viscous" viscosity than fully synthetic oil to achieve the same protective effect.

Fully synthetic motor oil has better fluidity than semi-synthetic, which not only makes it easier to start the vehicle in cold areas, but also greatly avoids engine wear caused by insufficient lubrication for cold starts.

Use a less viscous oil to keep the oil path clear. If in the high temperature season or under the condition of severe engine wear, it is selected.

The use of high-viscosity oil is conducive to the formation of oil film and reduces engine wear.

1.Fully Synthetic Engine Oil: Fully synthetic engine oil has better high and low temperature performance, longer oil change intervals and is suitable for more severe conditions with Senbi vehicles.

It is suitable for luxury high-performance cars, and it can be replaced around 10,000-12,000 kilometers.

2.Semi-synthetic engine oil: The replacement cycle of semi-synthetic engine oil is generally about 8000-10000 kilometers, and the dry difference is moderate and the performance is moderate.

3.Mineral oil: This type of oil generally needs to be replaced after about 5000 kilometers.

Try to choose multi-grade oil, multi-grade oil has a better protection effect on the engine due to saving, long life and high efficiency. The base is not a spring peel in multi-grade oil.

In the process of use, there may be premature blackening, and the oil pressure is smaller than that of ordinary engine oil, which is normal.

The advantage of fully synthetic oil is that it has good fluidity at low temperature, strong oxidation resistance at high temperature, suitable for the use of a wide range of engine temperatures, long oil mileage, if you cherish the vehicle, it is recommended to use fully synthetic engine oil, but now there are many brands of engine oil, three types of base oil call themselves fully synthetic engine oil, the real full synthetic engine oil is blended with four types of base oil, the price is relatively high, one liter is more than 100 yuan, if you choose fully synthetic engine oil, give you an index reference, look at the value of high temperature and high shear, The English abbreviation is hths, if it is above, no problem. Semi-synthetic engine oil, it is a mineral oil and fully synthetic engine oil in proportion, and then socks with which to add additives to a mixed product, cost-effective good, performance is much better than mineral oil, is a very balanced product, theoretically speaking, most of the code models can be used.

Semi-synthetic engine oil 5000 kilometers to change the oil, fully synthetic engine oil 8000 kilometers to change the oil, in fact, the price is about the same, then I want to ask the use of fully synthetic engine oil 8000 kilometers to change the oil, or semi-synthetic oil 5000 kilometers to change the oil is better for the engine? Semi-synthetic engine oil 5000 kilometers to change the oil, fully synthetic engine oil 8000 kilometers to change the oil, in fact, the price is about the same, then I want to ask the use of fully synthetic engine oil 8000 kilometers to change the oil, or semi-synthetic oil 5000 kilometers to change the oil is better for the engine? Fully synthetic engine oil will be better in terms of performance, especially in engine protection, anti-oxidation performance, low temperature starting performance, etc., it will be better than semi-synthetic products, of course, it will naturally be higher than semi-synthetic products.

Semi-synthetic motor oil and fully synthetic motor oil are the two classifications of motor oil. 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.

Hello, fully synthetic engine oil contains more additives, its service life is longer than semi-synthetic engine oil, generally speaking, in our country driving vehicles with semi-synthetic engine oil can be used 8000 kilometers, fully synthetic engine oil can reach more than 10000 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.

If I can help you, I hope to set the best, thank you Hello! Fully synthetic motor oil is good. Fully synthetic motor oil, Shell Helix fully synthetic motor oil is pretty good @2019

The difference between fully synthetic and semi-synthetic engine oil is that the base oil is different, the replacement interval is different, the applicable temperature is different, the applicable vehicle conditions are different, the additives used are different, and the protection of the engine is different.

1. The base oil is different

Semi-synthetic motor oils use Group 3 base oils; Fully synthetic motor oil is used.

Class III, IV and V base oils are blended. Fully synthetic motor oils are one grade higher than semi-synthetic motor oils in the selection of base oils.

2. The replacement cycle is different

Semi-synthetic engine oil should be replaced once every six months or 7,500 kilometers during use; Fully synthetic engine oil is changed once a year or 10,000 kilometers during use. Of course, the specific engine oil should be changed according to the specific replacement cycle.

3. The applicable temperature is different

Fully synthetic engine oil can be used at a wider temperature, and in the same working environment, fully synthetic oil can achieve the purpose of protecting the engine with a lower viscosity, while semi-synthetic engine oil has relatively high requirements.

4. The applicable vehicle conditions are different

Semi-synthetic engine oil is more suitable for economical, small displacement and smooth driving models; Fully synthetic engine oil can be used in a variety of harsh and harsh conditions, with better resistance to high temperature and low temperature, and is more used in turbocharged engine models and high-end models.

5. The use of additives and sales of molding agents is different

The additives used in fully synthetic motor oils have a high content of TBN, which makes the oil last longer and cleans the engine; Semi-synthetic motor oils use additives with low levels of TBN and shortened oil maintenance intervals, resulting in sulfide salt ash.

6. The protection of the engine is different

Fully synthetic motor oil is better than semi-synthetic motor oil in terms of performance, so fully synthetic motor oil is better than semi-synthetic motor oil in protecting the engine and cleaning the inside of the engine.

In the same working environment, the use of fully synthetic oil with a lower viscosity can achieve the purpose of protecting the engine, while the use of semi-synthetic engine oil has relatively high requirements. Fully synthetic motor oil can be used in a variety of harsh conditions, and has good resistance to high and low temperatures.

Fully synthetic engine oil is recommended to be used for more than one year, and the mileage can be changed up to 10,000 kilometers. No matter what brand of engine oil, buying a fully synthetic engine oil is the best choice. The quality of the fully synthetic engine oil is better, the cold start is smoother, the fuel is more saving, the oil change interval is longer, the service life of the engine is extended, the maintenance rate is reduced, and the engine block is cleaner due to the superior cleanliness of the synthetic engine oil.

Semi-synthetic motor oil contains certain mineral motor oils, and semi-synthetic motor oils are a mixture of traditional mineral motor oils and synthetic motor oils. Thanks to the addition of synthetic base oils, you get more performance and protection than when using conventional mineral oils alone.