In fact, as early as two years ago, Honda CR-V also experienced this situation, which even triggered the rights protection incident of car owners in the north. However, under the official investigation, it is found that the phenomenon of "increased engine oil" is mainly related to the fact that car owners are mostly driving at low temperature and low speed. This time, some experts responded to the increase in engine oil and the engine oil cover emulsifying phenomenon discovered by Toyota owners.
"Increased engine oil" frequently appears in the north, which is related to the weather.
The so-called "increase in oil quantity" actually means that when the owner checks the dipstick, he finds that the oil quantity exceeds the maximum scale value. The reason why this phenomenon occurs requires the following three conditions.
The first condition is that the engine of the vehicle adopts the side cylinder direct injection mode. During the operation of the engine, some gasoline and water vapor sprayed by the injector condense into water droplets, which adhere to the inner wall of the cylinder, resulting in "wet wall phenomenon", and then flow into the crankcase through the piston ring and mix with the engine oil.
The second condition is that the vehicle is driving in cold weather. Due to the cold weather, the engine warm-up time is longer. If the user does not make adequate preparations for preheating, some gasoline and water vapor flowing into the crankcase before will not volatilize and will remain in the crankcase all the time, which is one of the reasons why car owners in the north find that there is more engine oil than in the south.
The reason why the heat engine work is not done well is mainly related to the third condition. That is, most car owners are driving at low temperature, short distance or low speed, and the general engine has reached the destination before preheating, which is also the main reason for the rapid increase of engine oil. In this regard, Yao Chunde, a professor at the School of Mechanical Engineering of Tianjin University, gave suggestions. When the weather is cold, running a few laps at high speed can effectively solve the problem of increasing oil.
"Oil cap emulsification" is a normal physical phenomenon.
If the increase in oil is mainly affected by the weather and driving habits, as long as the owner regulates the use of the car, there will be no impact. Then the emulsification of the oil cover is a normal physical phenomenon, and the owner does not need to worry too much.
Generally speaking, the emulsification of the oil cover is actually that the oil cover is covered with a milky white sticky substance. The reason of emulsification is that when the engine is running, the water vapor in the combustion chamber enters the crankcase with blowby gas and covers the oil cover, and condenses into water droplets. Because water and engine oil are immiscible, the oil cover will be emulsified.
However, the emulsification of the oil cover is also reversible. The reason why the condensed water droplets on the oil cover are emulsified is mainly because they cannot evaporate. When the engine temperature rises, the water on the oil cover will naturally evaporate and the emulsifying phenomenon will disappear.
In fact, the emulsification of the oil cover is not a problem. If the owner finds that the oil is emulsified, that is what needs attention. As Professor Shuai Jin Shi, deputy director of the Combustion Energy Center of Tsinghua University, suggested, if the oil turns white by dipstick detection, it means that the oil is in danger of complete emulsification. In this case, there is a high probability that the engine has cracks or a lot of water seepage, and then the owner needs to worry about the engine problem. Moreover, if it is only the emulsification of the oil cover, it will not affect the normal use of the car.
As far as the real causes of "engine oil increase" and "engine hood emulsification" reflected by some Toyota owners are concerned, these phenomena belong to the normal working range of the engine and are reversible, so Toyota owners need not worry too much. And Toyota's engine technology has been widely praised. As long as the owner drives regularly, there will be no big problem in maintaining the car regularly.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.