Insufficient engine oil and reduced oil pressure lead to poor lubrication, which will accelerate the wear of components, and in severe cases, there may be shoe burning and shaft holding faults. Therefore, some rotary drilling rig drivers prefer to add more engine oil at once, greatly exceeding the specified limit (quantity), in order to achieve the goal of once and for all. Who knows, excessive oil will have adverse consequences: excessive oil can easily cause oil leakage, increase the consumption of oil, not only pollute the environment, but also increase the difficulty of maintenance; A high oil level will increase the motion resistance of the connecting rod and reduce the efficiency of the rotary drilling rig; Too much engine oil is easy to burn up by channeling up the combustion chamber, increasing the consumption of engine oil.