The best test to see if your oil is contaminated is through a micron gauge.;Viscosity is a measure of the weight of the oil.;Black Gold vacuum pump oil is an ISO 41, special to this type of application.

• JB Industries Bottle of Black Gold Vacuum Pump Oil , 1 quart
• 1 quart
• Multicolored

JB Industries Bottle of Black Gold Vacuum Pump Oil , 1 quartStandard Plumbing Supply