What Is the Weight of Hydraulic Oil Per Gallon?

A gallon of hydraulic fluid weighs 7.2 pounds. It has a density somewhat lower than water, which weighs 8.2 pounds per gallon. Common hydraulic fluids are derived from mineral oil.

Good hydraulic fluids have sufficient viscosity to prevent leakage via seals but are not so viscous that they impede the pump’s ability to move through the system. In addition to providing appropriate lubrication to reduce wear, they must have the thermal stability to work reliably across a wide range of temperature ranges. Foam inhibitors lower the surface tension of the fluid, allowing air bubbles to disperse without producing foam. Foam increases wear and decreases the lubricating capacity of the fluid.

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