Agilent Varian GP DS19 General Purpose Mechanical Pump Oil (sold here by the 1 liter bottles 9499390). Varian GP Oil has been replaced with this oil, Agilent GP DS19 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 GP Oil 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.