Waste Oil Recycling Machine ----- YANGJIANG How to detect the engine oil? Generally speaking, the car needs the engine oil to keep running. The engine oil can play the role of lubrication and wear reduction for the engine. In addition, it can also play the role of auxiliary cooling, sealing and leak proof, shock absorption and buffer for the car. The engine of the vehicle can’t reach the peak performance without engine oil. That is to say, the engine oil is the blood of the cars. While the engine oil may mix with impurities such as the metal debris or moisture after a long-term use. Then the color of the engine oil may turn into black. And if the car continues to use the black oil, the oil may cause damage to the parts of the engine. So it is essential to check the engine oil to ensure the best performance. The ways to check the the engine oil are as follows. 1. Make sure the engine isn't hot. You may burn yourself if you handle engine parts right after you ...