Partial-synthetic vacuum pump lubricant combining the cost-effectiveness of mineral oil with synthetic base stock performance enhancements for industrial rotary vane and piston vacuum pumps. Provides improved oxidation stability and extended service life over conventional mineral vacuum pump oils in manufacturing applications. 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.