Viscosity and Additive Packages
Choosing the correct viscosity is the most important single decision in lubricant selection — additives are secondary but essential.
Viscosity grade (ISO VG 32, 46, 68, 100, 220, 320) refers to the average kinematic viscosity at 40°C; the correct grade depends on operating speed, temperature, and load.
EP (extreme pressure) additives typically required for gearboxes operating under heavy loads and shock conditions — common on blower drives and large gear pumps.
Anti-wear additives typically required for hydraulic systems and lightly loaded gearboxes that operate at moderate loads continuously.
Cross-substituting lubricants without confirming additive compatibility is a common cause of equipment failure — when in doubt, use the original spec and document the brand used.
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