Skip to main content
  • What is Differential Fluid, Gear Oil or Gear Lube?
  • Gear Oil vs. Engine Oil: What’s The Difference?
  • What is Hypoid Gear Oil? (And Other Gear Oil Questions Answered)
  • What Does a Limited-Slip Additive Do?
  • Why Upgrade Your Differential Cover?
  • What is a Limited-Slip Differential (and What Type of Gear Lube Should I Use)?
  • More AMSOIL Products Available in the Award-Winning Easy-Pack
  • Should I Change Fluid in a Filled-for-Life Transmission? Play Video
  • What Does Oil Viscosity Mean

    Oil viscosity is the measure of its resistance to flow. How quickly or slowly motor oil flows affects how well it protects your engine.

    Learn More

    Get More Great Content Delivered to Your Inbox

    Sign up for bi-weekly updates.

    *Indicates a required field.