Inventory of the four major misunderstandings of lubricating oil change

 

Car lubricants are used very frequently during maintenance. In addition to protecting the engine and reducing the number of oil changes, high-quality lubricating oil can also save gasoline costs. In this season, we must also be careful not to cause car breakdowns due to improper use of lubricants. The “improper” use method generally stems from the four “misunderstandings” of car friends about lubricants.

Misunderstanding XNUMX: Add more lubricating oil

The amount of lubricating oil should be controlled between the upper and lower marks of the oil dipstick. Because too much lubricating oil will escape from the gap between the cylinder and the piston into the combustion chamber and burn to form carbon deposits. These carbon deposits will increase the compression ratio of the engine and increase the tendency of knocking; the carbon deposits in the cylinder are red hot and easily cause pre-ignition. If they fall into the cylinder, they will aggravate the wear of the cylinder and piston, and will also accelerate the pollution of the lubricating oil. Secondly, too much lubricating oil increases the stirring resistance of the crankshaft rod and increases fuel consumption.

Misunderstanding XNUMX: When the lubricating oil turns black, it is time to change the oil

This understanding is not comprehensive. For lubricating oils that have not been added with a detergency dispersant, the darkening of the color is indeed a sign that the oil has been severely deteriorated, but the lubricating oil used in modern cars generally has a detergency decomposer added. This detergent will wash off the glue film and black carbon deposits adhering to the piston and disperse them in the oil to reduce the generation of high-temperature deposits in the engine. Therefore, the color of the lubricating oil will easily turn black after a period of use, but at this time The oil has not completely deteriorated.

Misunderstanding XNUMX: Lubricating oil is often added and not changed

Always check that the lubricant is correct, but only supplementation without replacement can only make up for the lack of oil quantity, but cannot fully compensate for the loss of lubricant performance. The quality of lubricating oil will gradually decline due to pollution, oxidation and other reasons during use. At the same time, there will be some consumption, which reduces the number.

Misunderstanding XNUMX: Additives are useful

The real high-quality lubricant is a finished product with a variety of engine protection functions. A variety of additives have been included in the formula. Including anti-wear agents, and lubricants* pay attention to the balance of the formula to ensure the full play of various properties. Adding other additives by oneself will not only not bring additional protection to the vehicle. On the contrary, it is easy to react with the chemicals in the oil.

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