Resources
- American Petroleum Institute
- American Petroleum Institute Industry Statistics
- Energy Information Administration
- Government Fuel Economy
- Organization of the Petroleum Exporting Countries
- Plant Maintenance Resource Center Industrial Maintenance Portal
- U.S. Department of Energy
- U.S. DOE - Energy Efficiency and Renewable Energy
- Des-Case Corporation - Desiccant Breathers
- Petro-Canada
- ExxonMobil Lubes
- Citgo Lubes
- Citgo Gear