Shell Naturelle S4 Gear Fluid 100
Shell Naturelle S4 Gear Fluid 100 is an advanced biodegradable synthetic lubricant developed for use in demanding gear and bearing applications, particularly in environmentally sensitive areas. Formulated from fully saturated synthetic esters and advanced additive technology, the fluid provides excellent load carrying performance, reliable wear protection and extended service life. The product is classified as an Environmentally Acceptable Lubricant (EAL) and complies with the United States Environmental Protection Agency Vessel General Permit (EPA VGP) requirements, making it particularly suitable for marine applications where environmental protection is a priority.
One of the key advantages of Shell Naturelle S4 Gear Fluid 100 is its high viscosity index and shear stability. These characteristics allow the lubricant to maintain consistent viscosity across a wide range of operating temperatures, helping to ensure effective lubrication during both cold start conditions and high temperature operation. Maintaining stable viscosity improves the formation of a protective oil film between metal surfaces, reducing friction and wear while supporting efficient gear and bearing operation.
Shell Naturelle S4 Gear Fluid 100 also offers excellent resistance to oxidation and hydrolysis due to its fully saturated ester base fluid formulation. These properties help protect the lubricant from degradation in demanding operating environments, particularly where moisture or high temperatures are present. By resisting oxidation and chemical breakdown, the lubricant can potentially extend service intervals compared with conventional mineral gear oils, helping to reduce maintenance frequency and improve equipment reliability.
Another important benefit of Shell Naturelle S4 Gear Fluid 100 is its outstanding load carrying and anti-scuffing performance. The fluid is formulated with advanced non-toxic additives designed to protect gears and bearings operating under heavy loads and shock conditions. This strong load carrying capacity helps minimise wear, extend component life and maintain reliable performance in demanding mechanical systems.
Shell Naturelle S4 Gear Fluid 100 also contributes to maintaining system efficiency through excellent water separation properties. Water contamination can negatively affect gear lubrication performance and accelerate component wear. The fluid’s demulsification characteristics allow excess water to separate easily from the lubricant so it can be drained from the system, helping to maintain clean oil and efficient lubrication of contact surfaces.
The lubricant is suitable for a range of marine and industrial applications including propulsion drives, thrusters and controllable pitch propeller systems. It can also be used in industrial gearboxes, bearings and other components operating in circulated or splash lubricated systems. These capabilities make Shell Naturelle S4 Gear Fluid 100 particularly valuable for marine vessels, offshore equipment and industrial installations where environmental compliance and high performance lubrication are required.
Physical characteristics include a kinematic viscosity of approximately 100 mm²/s at 40°C and 14 mm²/s at 100°C with a viscosity index of approximately 140. The fluid has a density of approximately 919 kg/m³ at 15°C, a flash point of approximately 280°C and a pour point of approximately –24°C, supporting reliable lubrication performance across a wide range of operating conditions.
