How to identify a good engine oil? How to identify good and bad engine oil

There are two main criteria for choosing an oil:

Viscosity] (note the packaging "SAE"), such as 5W W W-30; 5w
w
w-40.。。When buying engine oil, first look at the word behind w, the viscosity of 40 is thicker than 30, and then look at the word in front of w, 10w is suitable for -25 climate use, and 15w is suitable for -20 climate use.

Quality grade] (note that the packaging "API" is indicated) such as SH, SI, SJ... "S" stands for gasoline vehicles, SJ is of high quality, followed by SI, then SH, and so on; The prefix "C" stands for diesel vehicles.

For cars, most of the time it is suitable for viscosity 10W-30, and the quality grade is suitable for 10W-40 in Si or SH months, because the viscosity of 40 is slightly larger, which is more suitable for engine lubrication at high temperatures).

As for the brand, it can be Shell, Castrol. If it's good, or Mobil One. My suggestion is to remove the highest and lowest quality grades, and choose the right viscosity of 10w-30, and 10w-40 in special high temperature months.

Engine oil is composed of base oil and additives, if you want to choose a good engine oil, the most important thing is to look at the base oil, like the common full synthesis is the second class, the third class of base oil, the slightly better is the PAO class of full synthesis, which is more high-end. I changed my own PAO base oil-based GT Magic Red engine oil, the comprehensive performance is very strong, the intuitive performance is that the maintenance cycle is longer, GT Magic Red more than 10,000 kilometers before attenuation, 15,000 kilometers to replace. I choose engine oil according to this standard.

The oil label consists of two parts: grading and viscosity specification. The oil designation usually indicates viscosity and quality. The specific interpretation is as follows: the viscosity of lubricating oil is mostly marked by SAE and other grades, and SAE is the abbreviation of the English "Society of Automotive Engineers".

Automobile oil sorting skills.

At present, there are a lot of fakes on the market, and many car owners can't identify the quality of lubricating oil, so now teach you a few tricks.

First, be observant. If the oil is clear and yellow-brown, it means that its quality is better; If the color is cloudy or emulsified, it means that it contains a lot of water; If the oil has a burning smell, it means that it has been oxidized prematurely or mixed with other oils.

The second is to check if there is sediment, and a lot of sediment is by no means a good oil.

Third, you can drop the oil on the iron plate or exhaust pipe above 110, if there is a popping sound, it means that the oil contains water. In fact, the safest way is to go to a designated dealership, a big brand gas station or a repair shop to buy or change oil.

The choice of lubricating oil should be based on the requirements of the engine, and neither overly advanced oil can be used on less demanding engines, nor can lower grade oil be used on more demanding engines. The choice of lubricant can be based on the manufacturer's recommendation, or the choice of synthetic engine oil for better performance.

In addition, there are now motor oils on the market that can be used for both winter and summer. General purpose oil can maintain stable lubrication performance regardless of temperature changes, and play a better role in protecting the engine. Therefore, this oil is the best choice.

Experts say additives are generally not recommended in lubricants. Because the lubricant itself is made up of base oils and additives, its formulations have been extensively tested and screened. The addition of additives can be counterproductive, not only reducing the original cleaning and anti-wear function of the lubricant, but also increasing sludge and carbon deposits, affecting the performance and service life of the engine.

Professionals remind that when replacing the lubricating oil, the lubricating oil filter element generally needs to be replaced, so that the newly replaced lubricating oil can play a better role. Lubricant products between different brands cannot be mixed.

It is best not to mix different brands of engine oil when changing the engine oil for your car, and the quality of the engine oil will also affect the service life of the car, so we should be more cautious about the engine oil.

Motor oil is undoubtedly the blood of a car. Good engine oil can maintain the car to a certain extent, while poor quality engine oil can cause varying degrees of damage to the car. Therefore, the method of oil selection is very important. Here are some simple and useful identification methods for you.

One: Packaging. In general, the packaging appearance of motor oil is distinguishable.

The sealing cap of the brand-name oil is a disposable cap, and there is a sealing foil at the gap, and the foil has a manufacturer's special logo. If there is no such thing, the description is unprofessional, it may be fake oil, if there is a famous brand oil, there is also an anti-counterfeiting mark.

Second, look. Both real oil and good oil color are transparent, free of impurities and suspended solids. When shaking, it can be seen that the fluidity does not agglomerate. If it is a fake or low-quality oil, it may have deposits and opacity, or clumps.

Third, smell.

In general, motor oil is blended with base oils and additives. If mineral oil is used as a synthetic oil, it is most convenient and reliable to identify by smell. Generally, the smell of motor oil is milder. If there is a pungent odor, especially if the smell of fuel is heavy, it may be **oil.

Fourth, shake. A good engine oil will produce certain bubbles after shaking vigorously. If the bubbles slowly disappear, it may be a low-quality engine oil because a good oil has good fluidity.

The verb (short for verb) touches.

If it is a good oil, dip it directly with your hand and twist it, and you should feel that the oil is smooth. If it is an inferior oil, it will appear very sticky, with granular impurities, poor viscosity, and even an astringent taste. So, it's also a simple and effective way to do it.

Of course, if you want to avoid some worries, you can choose to go to a reputable store to buy products from well-known lubricant brands, which is a more worry-free approach.