Shell Spirax S4 CX 50
Shell Spirax S4 CX 50 is a high-performance transmission and final drive lubricant developed for use in heavy-duty off-highway equipment. Formulated with high-quality base oils and advanced additive technology, the lubricant is designed to provide reliable protection and smooth performance in transmissions, final drives and oil-immersed brake systems. The oil supports long equipment life and dependable performance in demanding construction, mining and agricultural operating environments.
One of the key advantages of Shell Spirax S4 CX 50 is its excellent friction performance and compatibility with modern friction materials. Heavy-duty equipment often uses advanced metallic and non-metallic materials in powershift transmissions and wet brake systems. The lubricant provides stable and consistent friction characteristics that help minimise clutch slippage and ensure smooth, quiet brake operation. This supports reliable transmission engagement and improved machine control during demanding operations.
Shell Spirax S4 CX 50 also delivers outstanding anti-wear protection for heavily loaded drivetrain components. The shear-stable SAE 50 viscosity grade provides strong film strength and effective lubrication under high load conditions, particularly in heavily loaded final drive systems. By maintaining a durable protective oil film between gear surfaces and bearings, the lubricant helps prevent wear, pitting and scoring. This contributes to extended component life and improved reliability for heavy-duty machinery.
Another important benefit of Shell Spirax S4 CX 50 is its strong low-temperature performance. The formulation is designed to meet demanding viscosity and fluidity requirements at lower temperatures, allowing the oil to circulate efficiently during equipment start-up. Rapid oil flow helps ensure early protection for critical drivetrain components, reducing wear during cold start conditions and supporting consistent equipment performance.
Shell Spirax S4 CX 50 also offers excellent oxidation stability and deposit control. The lubricant contains oxidation inhibitors that help prevent oil degradation during high-temperature operation. These additives help maintain oil cleanliness, suppress foaming and protect both ferrous and non-ferrous metal surfaces from corrosion. As a result, the lubricant helps maintain stable performance and extended service life in demanding heavy-duty operating environments.
The lubricant is recommended for use in heavy-duty off-highway equipment manufactured by leading companies such as Caterpillar, Komatsu and Komatsu-Dresser. It is suitable for use in powershift transmissions, final drives and oil-immersed brake systems, as well as transmissions produced by Eaton, Eaton Fuller, ZF, Dana and Rockwell. The product meets Caterpillar TO-4 performance requirements and is also suitable for applications requiring Allison C-4 type fluids. Physical characteristics include a kinematic viscosity of approximately 217.4 mm²/s at 40°C and 19 mm²/s at 100°C with a density of approximately 910 kg/m³ at 15°C. The oil has a flash point of approximately 205°C and a pour point of approximately –18°C, supporting reliable lubrication performance across demanding off-highway operating conditions.
