Learn more about machine oil selection

Learn & Design

Learn how to choose an oil for your machine. We've consolidated the basics to choosing a machine oil for your operation, machine tool, or piece of equipment.

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Learn more about calculating viscosity index


Convert between ISO, AGMA, and SAE standards or oils and lubricants. Determine viscosity index of your oil and more

Calculate »

Learn more about calculating viscosity index

Find & Buy

We don't make machine oils, but we use a lot of them. We built this tool to help you find the right oil for your machine and your shop

Find your oil »

Our Big List of Oils

We've compiled a list of oils and lubricants from all the major manufacturers to help you find what you need. Search here to find what you're looking for (and which are the same), without all the marketing fluff.

Big List of Oils »

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Calculate viscosity index

Viscosity changes with temperature, and Viscosity Index tells you how much. This calculator will tell you the viscosity index of your oil, so you can be sure it will function across the entire temperaturse range.

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Same viscosity grade but different viscosity index changes performance over temperature

Convert between standards

Several organizations (ISO, SAE, AGMA) have created competing standards to define oil viscosity ranges, but most of them mean the same thing. The chart to the right will show you how to convert between different standards

Conversion chart »

Conversion between ISO, AGMA, and SAE oil standards

Playbook & References

We believe having access to information allows better decision making, and strive to include as much as possible straight from the OEMs and reputable sources such as AGMA and STLE. As a general playbook we'd recommend:

  • Know as much as you can to distill facts and specifications from marketing materials
  • Consult the Original Equipment Manufacturer (OEM) for your machine
  • Find a local Certified Lubrication Specialist (CLS)