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Postal Address

Petro-Lubricant Testing Laboratories, Inc.
P.O. Box 300
Lafayette, NJ 07848, USA

+1 973-579-3448 Telephone:
+1 973-579-9447FAX:


Petro-Lubricant Testing Laboratories, Inc. has a single location at 116 Sunset Inn Road, Lafayette, NJ 07848.
The company was initially launched in 1979 as “Interstate Laboratory” by the company’s founders, John Wintermute and Josiah Wintermute, and on September 3, 1981 the company was incorporated as Petro-Lubricant Testing Laboratories, Inc.
With prior experience in the areas of high performance lubricants (oils and greases) testing and specialty pharmaceutical manufacturing, the brothers applied their combined knowledge and abilities to the physical and chemical testing of lubricants and the business of building a company.
Using only their private assets, with no government backed loans or outside investors, the brothers recognized the path to success lay in using their own hard work and skills to build the company from the ground up.
After initially leasing industrial space to get started, a five acre industrial lot in Lafayette was purchased and construction began. Acting as their own “construction company”, the laboratory was built as a fully climate controlled environment ideally suited to the company’s needs.
Although this approach may have been more laborious and time consuming, it provided cost saving benefits which could then be devoted to additional testing equipment and expansion of testing capabilities.
As the company continues to grow, additional staff is hired as talented individuals with the same exacting high standards of performance are found.
Currently, with a staff of fifteen employees, the company now offers a range of testing services and quality of performance for oils and greases that is unparalleled in the petroleum testing field.
More Information
Please see our Totally Independent and Quality Assurance Certifications pages.


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