Shell Morlina S4 B Oils Are High Performance Synthetic Bearing And Circulation Lubricants, Based On High Performance Base Fluids. They Offer Outstanding Lubrication Performance Under Severe Operating Conditions, Including Improved Energy Efficiency And Long Service Life Even In Severe Operating Conditions. Long Oil Life - Maintenance Saving The Use Of Highly Stable Synthetic Base Oils In Conjunction With A Robust Rust And Oxidation Inhibitor Package Helps Provide Excellent Oxidation And Thermal Stability.