We frequently discuss the differences between oil-free and oil-injected air compressors and their uses in various industries. While oil-free compressors are essential for pharmaceutical, food and beverage, and semiconductor production, oil-injected compressors are great for operation in harsh environmental conditions like those found in oil and gas, railway and marine applications. However, one issue that is often not considered is what happens to lubricant after it’s used in an oil-injected compressor.