Shell Naturelle S4 Gear Fluid 68
Shell Naturelle S4 Gear Fluid 68 is an advanced biodegradable synthetic lubricant developed for demanding gear and bearing applications, particularly in environmentally sensitive environments. Formulated from fully saturated synthetic ester base fluids and advanced additive technology, the fluid delivers excellent wear protection, strong load carrying capability and extended service life. Shell Naturelle S4 Gear Fluid 68 is classified as an Environmentally Acceptable Lubricant (EAL) and complies with the United States Environmental Protection Agency Vessel General Permit (EPA VGP), making it particularly suitable for marine equipment where environmental protection and regulatory compliance are essential.
One of the key advantages of Shell Naturelle S4 Gear Fluid 68 is its high viscosity index and excellent shear stability. These characteristics allow the lubricant to maintain stable viscosity across a wide range of operating temperatures, ensuring reliable lubrication performance during both cold start conditions and high temperature operation. By maintaining a consistent lubricating film between contacting metal surfaces, the fluid helps minimise friction and wear, supporting improved equipment reliability and extended component life in gear and bearing systems.
Shell Naturelle S4 Gear Fluid 68 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 when exposed to elevated temperatures, moisture or harsh operating environments. As a result, the lubricant has the potential to extend service intervals compared with conventional mineral gear oils, helping reduce maintenance frequency while supporting long-term equipment reliability.
Another important benefit of Shell Naturelle S4 Gear Fluid 68 is its strong load carrying and anti-scuffing performance. The lubricant is formulated with advanced non-toxic additives designed to protect gears and bearings operating under heavy loads and shock conditions. This strong load carrying capability helps prevent metal-to-metal contact, minimise surface damage and extend the operational life of critical mechanical components.
Shell Naturelle S4 Gear Fluid 68 also contributes to maintaining system efficiency through excellent water separation properties. Water contamination can negatively impact gear lubrication performance and accelerate equipment wear. The fluid’s demulsification properties allow excess water to separate quickly from the lubricant so it can be drained from the system, helping maintain clean oil and consistent lubrication performance throughout the equipment’s operating life.
The lubricant is suitable for a wide range of marine and industrial applications including propulsion drives, thrusters and controllable pitch propeller systems. It is also recommended for industrial gears, bearings and other components operating in circulated or splash lubricated systems. These characteristics make Shell Naturelle S4 Gear Fluid 68 particularly valuable for marine vessels, offshore equipment and industrial machinery operating in environmentally sensitive areas.
Physical characteristics include a kinematic viscosity of approximately 68 mm²/s at 40°C and 11 mm²/s at 100°C with a viscosity index of approximately 140. The lubricant has a density of approximately 909 kg/m³ at 15°C, a flash point of approximately 180°C and a pour point of approximately –24°C, supporting reliable lubrication across a wide range of operating conditions.
