• Extend the life of your pump. For use in any vacuum pump, BLACK GOLD is extremely pure and non-detergent. BLACK GOLD is hydro processed through a series of catalytic steps rendering the oil extremely refined, more viscous, and stable. The result is a clear mineral oil which alerts you to contamination sooner as it becomes cloudy or milky. • In extreme temperatures BLACK GOLD is more resistant to contaminants. We recommend that the oil be changed after every evacuation for maximum performance and pump efficiency. • The best test to check for oil contamination is through a vacuum gauge. With a leak-free system, if a vacuum gauge such as the DV-22N is not reading a deep vacuum, the oil is contaminated and should be changed. If the micron gauge pulls down to approximately 50 microns the oil is good.
