Some lubricant manufacturers take the added time and expense to have their products approved by an independent authority. Applying for the American Petroleum Institute (API) service category and certification is voluntary and up to the individual manufacturer. The API certification is designed to provide verification of an oil’s performance standards. These standards are set by U.S. and International Vehicle Manufacturers and the lubricant industry. Products not displaying the Starburst, Sheild, or Donut symbols are not licensed with the American Petroleum Institute and are not verified as meeting current performance requirements.
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