Gear Oil, ISO Viscosity Grade 320, SAE Grade 90W, Base Oil Synthetic, 16 oz. Container, Not Listed by NSF, Lubricant Additives No additives, a pour point of -33 degrees Fahrenheit, a flash point of 453 degrees Fahrenheit, a viscosity index of 210, an item of gear oil, AGMA Standard 6, and extreme pressure are all requirements. Use No, this formula provides improved engine protection.