Shell Naturelle S4 Gear Fluid 150
Shell Naturelle S4 Gear Fluid 150 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 lubricant delivers excellent wear protection, strong load carrying performance and extended service life. Shell Naturelle S4 Gear Fluid 150 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 critical.
One of the key advantages of Shell Naturelle S4 Gear Fluid 150 is its high viscosity index and shear stability. These characteristics enable the lubricant to maintain stable viscosity across a wide operating temperature range, helping ensure consistent lubrication performance during both low temperature start-up and high temperature operating conditions. Maintaining a stable lubricating film between contacting metal surfaces helps minimise friction and wear, contributing to improved reliability and longer component life in gear and bearing systems.
Shell Naturelle S4 Gear Fluid 150 also offers excellent resistance to oxidation and hydrolysis due to its fully saturated ester base oil formulation. These properties help protect the lubricant from degradation when exposed to high temperatures, moisture or challenging operating environments. As a result, the fluid has the potential to extend service intervals compared with conventional mineral gear oils, helping reduce maintenance requirements while supporting long-term equipment reliability.
Another important benefit of Shell Naturelle S4 Gear Fluid 150 is its strong load carrying and anti-scuffing performance. The lubricant is formulated with advanced non-toxic additives that provide reliable protection under heavy loads and shock conditions commonly encountered in gear systems. This helps protect gears and bearings from surface damage and excessive wear, ensuring dependable operation in demanding marine and industrial applications.
Shell Naturelle S4 Gear Fluid 150 also contributes to maintaining efficient lubrication systems through excellent water separation properties. Water contamination can compromise lubrication performance and accelerate component wear. The fluid’s strong demulsification performance allows excess water to separate quickly from the lubricant so it can be drained from the system, helping maintain clean oil and effective lubrication of gear contact surfaces.
The lubricant is suitable for a 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 capabilities make Shell Naturelle S4 Gear Fluid 150 particularly valuable for marine vessels, offshore equipment and industrial machinery operating in environmentally sensitive areas.
Physical characteristics include a kinematic viscosity of approximately 150 mm²/s at 40°C and 18 mm²/s at 100°C with a viscosity index of approximately 135. The lubricant has a density of approximately 927 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.
