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The Petroleum Quality Institute of America

The independent resource for information and insights on the quality and performance of lubricants in the marketplace.

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Articles of Interest

Lubricant Quality and Integrity
articles of interest
  • Engine Oil Labels 101
  • Yes, there is a problem with poor quality, off-spec lubricants
  • Are 4% of "Good" oils bad?
  • What is currently done to insure the quality of lubricants?
  • The games people play with tractor hydraulic fluid
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In The News

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Industry Links
  • API Service Classifications
  • API EOLCS Licensee Directory
  • List of dexos Licensed Engine Oils
FAQ
  • What is the best oil for my car?
  • Are synthetic engine oils worth the extra money?
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Resource Room

  • American Petroleum Institute License Directory
  • What API Service Classification Is Required for Your Engine?
  • Glossary of Terms - Lubricants
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