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How to identify the deterioration of automobile lubricating oil?
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Automobile lubricating oil tells you that after using for a period of time, the lubricating oil will deteriorate due to the pollution of mechanical impurities and dust from the outside, the metal chips worn down by running parts and the metal salts formed by the erosion of parts.
The lubricating oil of the automobile is black and foam after metamorphism. It has emulsified phenomenon. It is rubbed with fingers. It has no sticky feeling. It has bad or bad smell. It drops dark brown on the white paper, and has no yellow infiltrating area or many black spots. If it is not replaced in time, it will accelerate the wear of parts, affect the service life and even cause safety accidents. Therefore, it is particularly important to check whether the lubricating oil is deteriorated and replace it in time.
Several simple identification methods are introduced as follows:
1. Oil drop trace method
Take a clean white filter test paper and drop several drops of oil on the filter test paper. After the lubricating oil leaks, if there is black powder on the surface and it is astringent to touch by hand, it indicates that there are many impurities in the lubricating oil. Good lubricating oil has no powder, and it is dry and smooth with hands, and it shows yellow trace.
2. Oil flow observation method
Take two measuring cups, one of which holds the lubricating oil to be inspected, and the other one is empty on the table top. Lift the measuring cup full of lubricating oil 30-40 cm away from the table top and tilt it. Let the lubricating oil flow into the empty cup slowly. Observe the flow condition. The lubricating oil with good quality should flow in a slender, uniform and continuous manner. If the oil flow is fast and slow, and sometimes there are large pieces flowing down, then Said that the lubricating oil has deteriorated.
3. Illumination method
On sunny days, lift up the grease tank cover with a screwdriver at a 45 degree angle to the horizontal surface. According to the sunlight, observe the oil drop. Under the light, it can be clearly seen that there is no wear debris in the lubricating oil, which is good and can continue to work. If there is too much debris, the lubricating oil should be replaced.
4. Hand twisting
If the lubricating oil is twisted between the thumb and the index finger for repeated grinding, the better lubricating oil feels lubricity, less wear debris and no friction. If the greater friction feeling such as sand grains between fingers is felt, it indicates that there are many impurities in the lubricating oil and can not be used again, so a new lubricating oil should be replaced.
The lubricating oil of the automobile is black and foam after metamorphism. It has emulsified phenomenon. It is rubbed with fingers. It has no sticky feeling. It has bad or bad smell. It drops dark brown on the white paper, and has no yellow infiltrating area or many black spots. If it is not replaced in time, it will accelerate the wear of parts, affect the service life and even cause safety accidents. Therefore, it is particularly important to check whether the lubricating oil is deteriorated and replace it in time.
Several simple identification methods are introduced as follows:
1. Oil drop trace method
Take a clean white filter test paper and drop several drops of oil on the filter test paper. After the lubricating oil leaks, if there is black powder on the surface and it is astringent to touch by hand, it indicates that there are many impurities in the lubricating oil. Good lubricating oil has no powder, and it is dry and smooth with hands, and it shows yellow trace.
2. Oil flow observation method
Take two measuring cups, one of which holds the lubricating oil to be inspected, and the other one is empty on the table top. Lift the measuring cup full of lubricating oil 30-40 cm away from the table top and tilt it. Let the lubricating oil flow into the empty cup slowly. Observe the flow condition. The lubricating oil with good quality should flow in a slender, uniform and continuous manner. If the oil flow is fast and slow, and sometimes there are large pieces flowing down, then Said that the lubricating oil has deteriorated.
3. Illumination method
On sunny days, lift up the grease tank cover with a screwdriver at a 45 degree angle to the horizontal surface. According to the sunlight, observe the oil drop. Under the light, it can be clearly seen that there is no wear debris in the lubricating oil, which is good and can continue to work. If there is too much debris, the lubricating oil should be replaced.
4. Hand twisting
If the lubricating oil is twisted between the thumb and the index finger for repeated grinding, the better lubricating oil feels lubricity, less wear debris and no friction. If the greater friction feeling such as sand grains between fingers is felt, it indicates that there are many impurities in the lubricating oil and can not be used again, so a new lubricating oil should be replaced.