Semi-synthetic compressor fluid blending mineral oil and synthetic base stocks for improved oxidation stability and extended drain intervals over conventional petroleum compressor oils. An economical choice for industrial rotary screw and vane compressors where enhanced performance is desired at a cost-effective price point. Available in multiple ISO grades; sold in cases of 12 x 1-qt bottles, cases of 4 x 1-gal bottles, 5-gallon pails, and 55-gallon drums.