Answer: In many companies, after more than one year of use, the screw air compressor begins to leak or seep oil in multiple parts. The main oil leakage parts are the main engine sealing surface, oil and gas barrels and their pipelines. The oil leakage points on the main engine include shaft seals, end covers, oil pipe joints, pressure relief valves, etc.; the oil leakage points on the oil and gas barrels include oil pipe joints, oil pipes, oil level mirrors, oil and gas barrel covers, expansion joints, air hoses, etc.