Agilent Varian AVF Silver General Purpose Mechanical Pump Oil (sold here by the 1 Quart bottles K7516301). Varian GP Oil has been replaced with Agilent AVF Silver oil, Varian is now Agilent Technologies. It is quality mechanical vacuum pump oil for the ultimate performance of your Varian Agilent Rotary Vane pumps. Varian AVF Silver is specially prepared by Varian to meet the Rotary Vane exclusive specifications. We recommend that you change your vacuum pump oil at least every 3 months to prolong the life of your vacuum pump.