What is the best engine oil for a car and what are the selection criteria?

The main reason for choosing fully synthetic engine oil is to look at the quality of the base oil, such as magic red engine oil, four types of PAO-based fully synthetic engine oil, the maintenance cycle is 15,000 kilometers or one year, and the quality is higher than that of ordinary three types of fully synthetic engine oil.

The selection criteria are the grades formulated by the manufacturer, and we are really helping you look forward to it

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1. The selection principle is to first select the appropriate quality grade, and then select the required viscosity grade. The selection of the quality grade is based on the severity of the operating conditions of the internal combustion engine, the oil capacity and compression ratio, the nature of the fuel, etc.

2. When choosing the performance level, it is necessary to consider it comprehensively and flexibly according to the use environment. When choosing a diesel engine oil quality grade, it can be determined by the engine strengthening factor. However, when the sulfur content of diesel is greater than that, a higher grade of oil should be used.

3. You should choose a higher grade of oil, although the first is slightly higher, but the comprehensive economy is better, such as extending the oil change period, saving fuel consumption, reducing friction and wear, prolonging the service life of parts, and reducing maintenance costs.

1: The choice of single-grade oil and multi-grade oil: single-grade oil such as 5W, only in line with the SAE engine oil viscosity classification (a single grade, there are strict requirements for the applicable ambient temperature, such as SAE40 applicable to the minimum temperature is 0; Multi-grade oil can meet multiple viscosity levels at the same time, such as SAE15W 40, which means that its low-temperature performance can meet 15W, and high-temperature viscosity can reach 40, spanning 5 viscosity levels, so multi-grade oil can be used in all seasons.

Because multi-grade oil not only has good low-temperature flow and pumping performance, but also has high-temperature lubrication ability, it is the best choice to choose multi-grade oil, such as SAE5W 30 in the northern region, SAE15W 40 in the Central Plains, and 20W 50 in the southern region; However, multi-grade oil is much more expensive than single-grade oil, and from economic considerations, single-grade oil can also be used in some seasons, such as the use of SAE30 in spring and autumn in the northern region, and the use of SAE40 in summer; SAE40 is used in the central region except in winter; SAE30 is used in the southern winter, SAE40 in the spring and fall, and SAE50 in the summer. For the driving area throughout the north and south of the car must use multi-grade oil, such as SAE15W: the choice of oil viscosity grade, from the perspective of the development of automobile manufacturing technology, the manufacture of engines is becoming more and more sophisticated, and its output is developing towards high power and high load; From the perspective of changes in the environment of automobile use, with the continuous development of highways, the time for cars to run in high-temperature and high-speed environments is increasing, which puts forward more stringent requirements for engine oil.

From the perspective of maintenance economy, the lubrication performance of high-end engine oil is excellent, the parts are not easy to wear, the repair cost is reduced, and the oil change interval of high-end engine oil can reach 8000 10000km, and the synthetic engine oil is as high as 15000 25000km; Comprehensive in many aspects, it is still cost-effective to choose medium and high-grade engine oil.

Specialty car oils don't necessarily work for your car. Oiling your car also depends on the age of the car and the condition of the engine, as well as the regional conditions.

How to choose engine oil for automobiles.

1. During the running-in period, the engine oil is generally selected with low viscosity, and excellent wear resistance is required.

It is recommended to use relatively thin engine oil for cars within a kilometer.

After a few kilometers, slowly increase the viscosity of the oil.

4. Replace the 40 viscosity in summer and use the product with 30 viscosity in winter, which is convenient to provide better protection for the vehicle in different temperature environments.

As the vehicle ages, you need to consider your own driving habits and the performance requirements of the car to adjust the oil products used. The high viscosity of the engine oil can give more protection to the engine parts, which is suitable for the engine running at high temperature for a long time, and fills the gap between the engine due to the long-term virtual and long-term operation. A lower viscosity oil may be more fuel-efficient, with faster engine revs and more responsive acceleration.

Considering the normal wear and tear consumption of the engine, the gap between the mating surfaces becomes larger, and the viscosity of the engine oil should also be slowly increased with the age of the vehicle. Generally, it is recommended to use relatively thin engine oil for cars within 50,000 kilometers, and after 50,000 kilometers, slowly increase the viscosity of the oil, which is also the most suitable protection for the engine.

The engine oil products used in many car models are basically all-season oils, and usually private cars do not need special viscosity. However, according to the different urban climate conditions, you can consider replacing the 40 viscosity in summer and using 30 viscosity products in winter to provide better protection for the vehicle in different temperature environments.

The stop-and-go and long idle speed of the car in the city working conditions, the fuel combustion in the engine cylinder is not sufficient, and there is more oil sludge and carbon deposits in the engine. Especially for summer cars, it is recommended to shorten the oil change cycle appropriately.

Methods of oil selection:

It is best to use multi-viscosity lubricating oil when choosing engine oil, lubricating oil (also known as multi-grade lubricating oil) has the nature of light oil at low temperature, and has the nature of heavy oil at high temperature, and in the case of recommending the use of multi-grade oil, a multi-grade oil can replace a variety of single-grade oil.

Although multigrade oils are suitable for extremely cold and warm seasons and heavy-duty engine oils, especially those that do not have difficulty starting in cold weather, a single viscosity lubricant is often recommended to facilitate engine lubrication and extend engine life.

Benefits of motor oil:

1. Lubricity. The ability of engine oil to reduce friction, slow down wear and prevent metal sintering under various conditions is called engine lubricity. The viscosity of engine oil is an important indicator of lubricity.

2. Low temperature operability. From the engine oil aspect, the engine oil is easy to start and reliable to supply oil at low temperatures, which is called the low-temperature operability of engine oil.

The low-temperature operability of engine lubricants includes two aspects: good for low temperature starting and reduced starting wear. The main indicators to evaluate the low-temperature operability of engine lubricants are low-temperature dynamic viscosity, boundary pumping temperature and pour point.

In fact, our choice of engine oil is not to choose the most expensive, but should be based on the characteristics of our car engine, and our usual driving habits, to choose the right oil is the most correct. Engine oil is equivalent to human blood for a car, to put it simply, there is no way to drive a car without oil. Engine oil is mainly composed of two parts: base oil and additives, and the quality of the base oil determines the long-term performance of the oil; Additives can improve the lubricating properties of the oil.

The number of the oil.

Semi-synthetic oil and fully synthetic oil have their own number, which many car owners will notice when changing the oil, such as 5w-30 or 5w-40. These numbers represent oils with different frost resistance and high temperature viscosity. The number in front of the letter W indicates the fluidity of the oil at low temperatures, which is commonly known as the freezing point.

This number minus 35 indicates the lowest temperature at which the engine oil can be started, and the number after w indicates the high temperature viscosity of this engine oil, the higher the number, the greater the viscosity.

Choose according to the car series.

Before choosing engine oil, we must first figure out what kind of car our car is, specifically European, Japanese, American or something, because the engine of different types of cars has obvious differences in design, so the engine oil used is not the same. For example, we all know that American cars, the engine is more precise, the gap between parts is smaller, and the oil of 5w-30 is the most suitable. As for German cars, turbocharging technology is usually used, and the gap will be relatively large, and it will be relatively better to choose 5W-40.

Japanese and Korean cars will use more viscosity oils, such as: SAE 0W W W W-30; The choice of engine oil for domestic cars is not much different from that of Japanese cars, after all, many domestic cars are imitations of Japanese car engines, and even directly used Mitsubishi or General Motors engines.

Different models are available depending on the age of the vehicle.

Each car will be equipped with a maintenance manual as standard, referring to the maintenance manual on the car, new cars usually choose a slightly lower viscosity oil, as the car ages, slowly choose a slightly more viscous oil, because the older car engine wear will be more serious, choose a relatively higher viscosity oil.

Choose a model according to the season.

Knowing that the season is different, the choice of engine oil is not the same Generally, within the reasonable range specified in the driving manual, the engine oil suitable for use in winter is the first thing to look at the low temperature viscosity grade to ensure that the low temperature performance of our engine oil is very good. We will recommend the engine oil with better fluidity, that is, 5w-30, and try to choose the smaller value of the viscosity grade in summer, so that the high temperature viscosity of our engine oil is as low as possible. It is recommended to use engine oil with higher viscosity, that is, 5w-40.

In this way, the oil viscosity will not be high due to the low temperature, and the cold start performance will be relatively poor. However, in some areas, 5W-30 and 5W-40 engine oil can be used, so don't worry too much!

Finally, according to everyone's different driving habits, you can also choose the engine oil, if you are a friend who pursues speed, you usually drive the engine speed may be very high, then we can choose a fully synthetic engine oil.