Shell Spirax S1 ATF TASA
Shell Spirax S1 ATF TASA is a high-quality automatic transmission and hydraulic fluid developed to deliver reliable lubrication performance in a range of automotive and off-road applications. Formerly known as Shell Donax TM, the lubricant is formulated using carefully selected base oils and advanced additive technology to provide stable friction performance, wear protection and oxidation resistance. The fluid is primarily designed for use in heavy-duty vehicles operating in demanding off-road environments where dependable transmission and hydraulic performance are essential.
One of the key advantages of Shell Spirax S1 ATF TASA is its strong oxidation and thermal stability. Automatic transmission and hydraulic systems can operate under high temperatures and varying load conditions, which can accelerate oil degradation. The advanced formulation helps resist oxidation and maintain stable performance even during prolonged operation, helping extend fluid life and maintain consistent lubrication performance across the service interval.
Shell Spirax S1 ATF TASA also provides excellent dispersancy and friction retention characteristics. The dispersant additives help keep contaminants suspended in the fluid, preventing the formation of harmful deposits that could affect system performance. At the same time, the fluid maintains consistent friction characteristics required for smooth and reliable operation of automatic transmissions and torque converter systems. This helps ensure stable transmission performance and smooth gear engagement during operation.
Another important benefit of Shell Spirax S1 ATF TASA is its shear stability and anti-wear performance. Transmission fluids are subjected to significant mechanical stress during operation, which can cause viscosity breakdown in lower quality fluids. The shear-stable formulation helps maintain viscosity stability under demanding conditions while the anti-wear additives protect critical components such as gears, pumps and bearings from excessive wear. This contributes to longer equipment life and improved reliability in both automotive and industrial applications.
Shell Spirax S1 ATF TASA is suitable for a variety of drivetrain and hydraulic applications. It is recommended for use in powershift transmissions and industrial torque converters where fluids meeting General Motors Type ‘A’ Suffix ‘A’ performance requirements are specified. The fluid can also be used in automatic transmissions and power steering systems in heavy trucks, off-road vehicles and certain older passenger cars. In addition, it may be used as a hydraulic oil in specific off-road equipment applications where this type of fluid is recommended.
The lubricant meets the General Motors Type ‘A’ Suffix ‘A’ specification for automatic transmission fluids. Physical characteristics include a kinematic viscosity of approximately 40 mm²/s at 40°C and 7.5 mm²/s at 100°C with a viscosity index of approximately 157. The fluid has a density of approximately 880 kg/m³ at 15°C, a flash point of approximately 170°C and a pour point of approximately –42°C, supporting reliable performance across a wide range of operating temperatures and conditions.
