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Compressor oil is a synthetic oil used to cool compression, lubricate the ball bearings within the compressor, and ensure optimal efficiency of the compressor by serving as a sealant to prevent leakage. We offer several brands in sizes ranging from quarts to 55 gallon drums. Dirt and debris within a hydraulic system can increase operating temperatures and cause damage quickly. Compressor oil should be changed in air compressors generally every 3 months (depending on usage) and every 7000-8000 hours of usage for rotary screw compressors.