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Frequently asked questions

Find answers to common questions about our products and services

  • 80W/140 is a wide-range gear lubricant viscosity grade where '80W' indicates cold-weather pumpability and '140' indicates the high-temperature viscosity, making it a very thick, heavy-duty oil suited for heavily loaded components such as rear axles, differentials, and final drives on trucks, agricultural equipment, and other heavy-duty machinery that specify this grade.

  • 80W/140 has a significantly higher high-temperature viscosity than 75W-90 or 80W-90, meaning it provides a thicker oil film under heavy loads and high heat. This makes it appropriate for high-torque, high-stress axle and differential applications where the OEM specifically calls for that grade, rather than a lighter multi-grade oil.

  • Mixing gear oils of different viscosity grades will alter the final viscosity and may compromise performance. If switching from another brand, draining and flushing the component before filling with TRUEGARD HD 80W/140 is recommended to maintain the integrity of the lubricant.

  • A 5-gallon pail holds roughly 18.9 liters, which typically exceeds the capacity of a single differential or axle. This size is most cost-effective for fleet operators, shops, or equipment owners servicing multiple units, while still being manageable for a single large piece of equipment with high-volume sumps.

Key Features

  • Wide-range 80W/140 viscosity grade where the 80W rating ensures cold-weather pumpability and the 140 rating delivers heavy-duty high-temperature viscosity for demanding operating conditions.

  • Formulated for heavily loaded components including rear axles, differentials, and final drives on trucks, agricultural equipment, and other heavy-duty machinery that specify this grade.

  • Provides a thicker oil film under heavy loads and high heat compared to lighter multi-grade gear oils such as 75W-90 or 80W-90, making it suitable for high-torque, high-stress drivetrains.

  • Intended for use in applications where the OEM specifically calls for an 80W/140 gear lubricant grade, not as a general-purpose substitute for lighter specifications.

  • Each 5-gallon pail holds approximately 18.9 liters, offering a cost-effective quantity for fleet operators, service shops, or equipment owners servicing multiple units or high-volume sumps.