Official Home Page Diesel Oil Matters

Think your truck’s got what it takes? Each week, we feature eye-catching custom diesel vehicles and the owners who love them. Submit photos of your truck for Diesel of the Week!

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I represent that I have all ownership rights to the material in the submitted content, including any photos, and I have read and agree to the API Terms and Conditions and Privacy Policy of the American Petroleum Institute. I agree that API may edit and publish the photos I submit in conjunction with my own name, without obtaining further authorization or review by me.^*

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American Petroleum Institute

Engine Oil Licensing and Certification System
200 Massachusetts Avenue, NW
Washington, DC 20001-5571
USA
Toll-free in the U.S. & Canada: 877-562-5187
Local & International: (+1) 202-682-8041
Email: DieselOilMatters@api.org

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Contact Diesel Oil Matters for information requests or to arrange meetings with API personnel.

Engine Oil Toolkit

Whether you’re looking for information on the new oil standards, seeking guidance on switching your fleet to these next-generation oils, or searching for practical recommendations to bring CK-4 and FA-4 oils into your shop, you’ll find answers in the toolkit.

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American Petroleum Institute

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Engine Oil Toolkit