1.Preferred ViscosityNormal pump operation (at rated conditions) is based on the use of SAE 10W oil in the 38_ to 82_ C (100_ to 180_ F) range (or comparable viscosities). 2.Permissible Viscosity When operating with SAE 10W oil in the 860 to 40 cSt (4000 to 180 SUS) range (-12_ to 35_ C or 10_ to 95