pao4dApplication. Polyalphaolefin 4 (PAO 4) serves as a Group IV base stocks and viscosity builders for a wide range of industrial lubricant products.2,115 Followers, 92 Following, 13 Posts - PAO4D | Admin Feily (@pao4d_official) on : Bonus New Member 100% Bonus Harian 30k Bonus Rollingan 1% Bonus Refferal 1%