1. Excessive engine oil

There are also standards for oil filling，More is not always better，If the oil is filled too much，Produces greater resistance to crankshaft rotation，Thereby affecting the power output，Increase fuel consumption。The amount of oil entering the combustion chamber is greatly increased，Increase carbon deposits in the combustion chamber，Increased piston movement resistance，Reduce engine power。At the same time, it will also cause the air-fuel ratio in the combustion chamber to change，Increase the chance of detonation，The noise will also increase。

2. Moderate carbon deposition

Old engine oil becomes thinner with use，More and more carbon deposits。If the engine oil is thin, it is easy to channel the oil，Causing more and more carbon deposits。When replacing new engine oil，The engine cannot adapt to the oil viscosity，May increase the speed，This causes loud engine noise。It is recommended to use high-grade gasoline to drive at high speed，It is best to keep seabet appdriving at more than 2500 rpm and open a box of high-grade oil and there should be improvement，Of course preventive cleaning is also possible。

3. The viscosity of the engine oil must be suitable

Different grades of engine oil have different characteristics，Its low-temperature start-up and high-temperature anti-wear、Adhesion also has different manifestations。The viscosity of engine oil is inversely proportional to temperature，When the engine is cold，High oil viscosity，If the selected engine oil is thicker，It will give the starter motor、Battery, etc. add additional losses。But if the engine oil is too thin，Under high temperature operation, it is difficult to form a sufficient protective film and cause insufficient lubrication，Resulting in increased wear of machine parts。If the vehicle manual recommends 5W-30，The engine noise becomes louder if the car mainly uses 5W-40，Then car owners need to pay attention。It is recommended to choose engine oil with the grade recommended in the vehicle manual。

4. Mixing of engine oil

This situation is also relatively common，Due to different technical formulas used by different brands，Potential adverse chemical reactions，Change its own characteristics，Thus causing wear and tear on the engine，Increased noise。It is recommended that car enthusiasts should not mix engine oil，Try to use the same brand of engine oil。In case of special circumstances, change to a different brand of engine oil，It is best to use the same brand of engine oil。

5. Encountering fake engine oil

This situation is also very likely to occur，Because novice drivers are doing maintenance on their cars，Added inferior engine oil。Due to “fake” oil its anti-wear、Cleaning、The lubrication and protection properties are very poor，Resulting in excessive seabet ioengine pressure，Thus increasing the wear、Increased noise。As a consumer，You need to know some relevant anti-counterfeiting knowledge，Can’t just hearsay，Know how to identify the authenticity of engine oil。

6. It is normal to make a loud noise when the car is cold

Most of the engine oil returns to the oil pan when the car is cold，At this time, the internal components of the engine lack lubrication，The engine temperature will become lower when starting a cold car，The lubrication performance of the engine oil is not at its best，Coupled with the engine warm-up speed, the noise will be louder，But after the car is warmed up, the noise and speed will drop again，This is normal。If the car does not return to normal after warming up，I suggest you check it out。

7. Psychological effects

This should be the majority，Human hearing has errors in different environments，You cannot tell whether the sound is getting louder just by listening to your ears，It is best to use a decibel meter to measure。Analysis from the technical perspective of oil viscosity，5W-20、5W-30 engine oil will be slightly noisier when driving in urban areas，Normal driving on the highway，The noise will be slightly smaller。5W-40、5W-50 oil will make slightly less noise when driving in urban areas，Driving normally on the highway，The noise will be slightly louder。

Suggestion

If after changing new oil，The engine sound starts to get louder，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 running in for a period of time，It is recommended that car owners go to the repair shop for inspection。After changing the new oil of course，Don’t deliberately identify the sound of the engine，Hearing the sound getting louder is probably a psychological effect。

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