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Maximize performance and extend the life of your pump with BLACK GOLD. 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. JB recommends 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 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.