Do you know the reason why the air compressor suddenly sprayed oil?

Many friends have reported that the air compressor suddenly starts to spray oil while being used. Therefore, I have summarized the following points for your reference:
1.The first reason that everyone can definitely think of is that if you add too much oil, you can add the oil level to the middle of the oil mirror;
2. Check if the design of the oil box is reasonable. If the pressure inside the box is too high, it can also cause fuel injection;
3. It is possible that the oil model is incorrect, which means whether the oil you use is suitable for the air compressor of that model. If the oil is not suitable and too thin, it can also cause fuel injection;
4. It is also possible that the piston ring is worn too much in daily use, causing air pressure to flow back into the crankcase and causing oil leakage;
When fuel injection occurs, attention can be paid to troubleshooting based on the above points, and then targeted solutions can be provided. Another important common sense is that the oil level of the air compressor should be maintained between the lowest and highest oil levels during operation.