Four simple and quick methods to detect whether lubricating oil has deteriorated
author: Ann
2024-11-29
After a period of use, the engine oil will deteriorate due to contamination by mechanical impurities and dust from the outside, metal chips from the wear of the running parts, and metal salts formed by the erosion of the parts.
After the engine oil deteriorates, it will be dark black, foamy and emulsified. When it is ground with fingers, it will not feel sticky, astringent or have a strange smell. When it is dropped on the white test paper, it will be dark brown, without yellow infiltration 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 accidents. Therefore, it is particularly important to check whether the engine oil is deteriorating and replace it in time.
Here are some simple identification methods:
1. Oil flow observation method
Take two measuring cups, one of which contains the lubricant to be checked, and the other is placed empty on the table. Lift the measuring cup filled with lubricant 30 cm-40 cm away from the table and tilt it, let the lubricant slowly flow into the empty cup, and observe its flow. The flow of good quality lubricant should be slender, uniform, and continuous. If the oil flow is fast and slow, and large pieces flow down from time to time, it means that the lubricant has deteriorated.
2. Hand twisting method
Twist the lubricant between the thumb and index finger and grind it repeatedly. The better lubricant will feel lubricating, less wear debris, and no friction. If you feel a large friction between your fingers, such as sand grains, it means that there are many impurities in the lubricant and it cannot be used anymore. You should replace it with a new lubricant.
3. Lighting method
On a sunny day, use a screwdriver to lift the lubricant at a 45-degree angle to the horizontal plane. Observe the oil droplets against the sunlight. If you can clearly see that there is no wear debris in the lubricating oil under the light, it is good and can continue to work. If there is too much wear debris, the lubricating oil should be replaced.
4. Oil drop trace method
Take a clean white filter paper and drop a few drops of oil on the filter paper. After the lubricating oil leaks, if there is black powder on the surface and it feels sticky when touched by hand, it means that there are many impurities in the lubricating oil. Good lubricating oil has no powder, feels dry and smooth, and has yellow traces.
After the engine oil deteriorates, it will be dark black, foamy and emulsified. When it is ground with fingers, it will not feel sticky, astringent or have a strange smell. When it is dropped on the white test paper, it will be dark brown, without yellow infiltration 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 accidents. Therefore, it is particularly important to check whether the engine oil is deteriorating and replace it in time.
Here are some simple identification methods:
1. Oil flow observation method
Take two measuring cups, one of which contains the lubricant to be checked, and the other is placed empty on the table. Lift the measuring cup filled with lubricant 30 cm-40 cm away from the table and tilt it, let the lubricant slowly flow into the empty cup, and observe its flow. The flow of good quality lubricant should be slender, uniform, and continuous. If the oil flow is fast and slow, and large pieces flow down from time to time, it means that the lubricant has deteriorated.
2. Hand twisting method
Twist the lubricant between the thumb and index finger and grind it repeatedly. The better lubricant will feel lubricating, less wear debris, and no friction. If you feel a large friction between your fingers, such as sand grains, it means that there are many impurities in the lubricant and it cannot be used anymore. You should replace it with a new lubricant.
3. Lighting method
On a sunny day, use a screwdriver to lift the lubricant at a 45-degree angle to the horizontal plane. Observe the oil droplets against the sunlight. If you can clearly see that there is no wear debris in the lubricating oil under the light, it is good and can continue to work. If there is too much wear debris, the lubricating oil should be replaced.
4. Oil drop trace method
Take a clean white filter paper and drop a few drops of oil on the filter paper. After the lubricating oil leaks, if there is black powder on the surface and it feels sticky when touched by hand, it means that there are many impurities in the lubricating oil. Good lubricating oil has no powder, feels dry and smooth, and has yellow traces.
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