After the car was replaced with new oil, the engine sound became louder, what's going on? Did you change the fake oil?
The following editor briefly introduces the 7 culprits that cause the engine noise to become louder after changing the oil.
1. Too much oil
There are also standards for engine oil filling, not that the more the better, if the amount of engine oil filling is too much, it will generate greater resistance to the rotation of the crankshaft, thereby affecting the power output and increasing fuel consumption. The amount of engine oil entering the combustion chamber is greatly increased, which increases the carbon deposit in the combustion chamber, increases the piston movement resistance, and reduces the engine power. At the same time, it will also cause the air-fuel ratio of the combustion chamber to change, increase the probability of knocking, and the noise will also increase accordingly.
2. Moderate carbon deposition
The older the engine oil is, the thinner it becomes and the more carbon deposits. If the engine oil is thin, it is easy to run out of the engine oil, causing more and more carbon deposits. When the new oil is replaced, the engine cannot adapt to the viscosity of the oil, which may increase the speed and cause loud engine noise. It is recommended to use high-grade gasoline to drive at high speed. It is best to keep running above 2500 rpm and open a box of high-grade oil should improve. Of course, preventive cleaning can also be carried out.
3. The viscosity of the engine oil should be suitable
Different grades of engine oil have different characteristics, and their low-temperature start-up and high-temperature anti-wear and adhesion properties also have different performances. The viscosity of the engine oil is inversely proportional to the temperature. When the engine is cold, the viscosity of the engine oil is high. If the engine oil is thicker, it will cause additional loss to the starter motor and battery. However, if the engine oil is too thin, it will be difficult to form a sufficient protective film under high temperature operation, resulting in insufficient lubrication, resulting in increased wear of the machine parts. If the vehicle manual recommends 5W-30, and the car mainly uses 5W-40, the engine noise becomes louder, then the owner needs to pay attention. It is recommended to choose the oil that is recommended by the vehicle manual.
4. Oil mixing
This situation is also relatively common, because different brands use different technical formulas, which may produce adverse chemical reactions and change their own characteristics, thereby causing wear and tear on the engine and increasing noise. It is recommended that riders should not mix oil and try to use the same brand of oil. In case of special circumstances, if you change to a different brand of oil, it is best to use the same brand of oil.
5. Encountered fake engine oil
This kind of situation is also very likely to happen, because the novice driver added inferior engine oil when maintaining his car. Because the "fake" engine oil has very poor anti-wear, cleaning, and lubrication protection properties, the engine pressure is too high, resulting in increased wear and noise. As a consumer, you need to know some relevant anti-counterfeiting knowledge, not just hearsay, but know how to distinguish the authenticity of engine oil.
6. The sound of the cold car is loud and normal
Most of the engine oil in the cold car state returns to the oil pan. At this time, the internal components of the engine lack lubrication, and the engine temperature will drop when the cold car is started. The reason for the speed will cause the noise to be too loud, but after the car is warmed up, the noise speed will drop again, which is normal. If it doesn't return to normal after warming up the car, I suggest you check it out.
7. Psychological effect
This should account for the majority. Human hearing has errors in different environments. It is impossible to judge the loudness of the sound by the ear alone. It is best to measure it with a decibel meter. From the technical point of view of oil viscosity, the noise of 5W-20 and 5W-30 engine oil will be slightly louder when driving in urban areas, and the noise will be slightly lower when driving normally at high speed. The noise of 5W-40 and 5W-50 oil products will be slightly smaller when driving in urban areas, and the noise will be slightly louder when driving normally at high speed.
suggestion
If the sound of the engine starts to become louder after replacing the new oil, car owners don’t have to worry too much. It is recommended to observe after running in for a period of time. If this situation still occurs after a period of running in, it is recommended that the car owner go to the repair shop for inspection. Of course, after replacing the new engine oil, don't deliberately distinguish the sound of the engine. It may be a psychological effect to hear the sound getting louder.
