Shell Omala S4 WE 680
Shell Omala S4 WE 680 is a high-performance synthetic industrial gear oil specifically developed for demanding worm drive applications. Formulated using specially selected polyalkylene glycol (PAG) base fluids and advanced additive technology, the lubricant delivers outstanding lubrication performance in severe operating environments. Shell Omala S4 WE 680 is engineered to provide long service life, superior wear protection and improved energy efficiency compared with conventional mineral oil-based gear lubricants.
One of the key advantages of Shell Omala S4 WE 680 is its ability to deliver extended lubricant service life. Industrial worm gear systems often operate under high loads and elevated temperatures that can accelerate lubricant degradation. Shell Omala S4 WE 680 is formulated with excellent oxidation and thermal stability, helping resist the formation of harmful oxidation products during prolonged operation. This stability allows the lubricant to maintain system cleanliness and consistent lubrication performance over extended service intervals, helping reduce maintenance requirements and operational downtime.
Shell Omala S4 WE 680 also provides excellent wear protection and strong resistance to micropitting. Worm gear drives typically experience significant sliding contact between gear surfaces, making effective lubrication essential to prevent metal-to-metal contact and surface damage. The advanced additive system offers strong load carrying capability and forms a durable lubricating film between contacting surfaces. This protective film helps safeguard gears and bearings even under heavy or shock loading conditions, extending component life and supporting reliable gearbox performance in demanding industrial applications.
Another important benefit of Shell Omala S4 WE 680 is its ability to improve system efficiency. The synthetic PAG formulation provides lower friction characteristics compared with mineral oil-based lubricants, helping reduce operating temperatures and improve the mechanical efficiency of worm gear systems. Rig testing and field experience have demonstrated efficiency improvements of up to 15% compared with conventional mineral gear oils and approximately 11% compared with other synthetic hydrocarbon lubricants. This improved efficiency can contribute to reduced energy consumption and improved equipment performance.
Shell Omala S4 WE 680 is recommended for enclosed industrial worm gear reduction systems operating under severe operating conditions such as high loads, very low or elevated temperatures and wide temperature variations. It is particularly suitable for applications where maintenance is infrequent or systems are difficult to access, including gear motor systems and installations such as yaw gears in wind turbine applications. The lubricant is also suitable for lubricating bearings and other components operating in splash or circulating lubrication systems.
Physical characteristics include a kinematic viscosity of approximately 664 mm²/s at 40°C and 107 mm²/s at 100°C with a viscosity index of approximately 259. The oil has a density of approximately 1070 kg/m³ at 15°C, a flash point of approximately 262°C and a pour point of approximately –39°C, supporting reliable lubrication performance across a wide range of demanding industrial operating conditions.
