TM 10-3930-671-10 Specifications Fuel Recommendations: Diesel Fuel Oil ASTM Grade No.  1 D and 2D, 45 Cetane Minimum, 50 Cetane Preferred. Engine Oil Recommendations: Diesel - API Service Classification CD/SE MIL - 45199B Ambient Temperature (Average) Viscosity: 32°F to 110°F (0°C  to 43°C) SAE 30 70°F to  0°F   (21°C  to -17°C) SAE 20W   0°F to -30°F  (-17°C to -34°C)   SAE 10W Engine Coolant Recommendation: 50% water and 50% ethylene glycol permanent-type antifreeze containing rust and corrosion inhibitors.  (Antifreeze protection level -34°F [-37°C].) E-108