Skip to main content
Shop AMSOIL
  • Diesel Engine Oil Specifications: Making Sense of CK-4 & FA-4
    Industry NewsDieselDiesel Events

    Diesel Engine Oil Specifications: Making Sense of CK-4 & FA-4

    The API CK-4 and FA-4 diesel engine oil specifications are designed to help meet tight regulations while providing excellent wear...

    • AMSOIL Performance Testing

    Laboratory tested and proven on the road.

    See how AMSOIL products perform in the lab and in the field.

    Check out the tests

    Get More Great Content Delivered to Your Inbox

    Sign up for bi-weekly updates.

    *Indicates a required field.