Product Tested

front label

Click above for larger image

back label

Click above for larger image

Warren Oil Company, Inc.

Company and Product Information

Corporate Office:
Warren Oil Company, Inc.
Dunn, NC

Website(s): www.warrenoil.com

Warren Oil Company was started in 1976 and is headquartered in Dunn, NC. The company is a leading independent lubricant manufacturer and marketer with distribution in all 50 states and exports going to 48 countries. Warren Oil owns and operates packaging facilities in Dunn, NC, Benton, AL, San Antonio, TX, Johnstown, PA, Marion, IL, and West Memphis, AR. The company purchased three of its five plants from Pennzoil. All of Warren’s facilities are equipped to manufacture and package a diverse product slate ranging from automotive motor oils to charcoal lighter fluid. 

Warren Companies manufacture and package lubricants under several proprietary registered trademarks; e.g., Warren, Lubriguard, Autoguard, Itasca, Coastal, LubriGold and Saxon.

AUTOGUARD 50/50 Pre-Diluted
Antifreeze Coolant

AUTOGUARD 50/50 Pre-Diluted
Antifreeze Coolant

Manufactured By: Warren Oil Company, Inc., Dunn, NC

Purchased at: Rochester, PA

Date of purchase: 10/11/2018


Website(s): www.warrenoil.com

Test Results and Assessment:

The freeze point of the sample tested meets the product’s labeled claim and based on the tests conducted, there are no issues with the quality of the product.


bottle icon
Apperance: Green and Clear
Physical Properties pass
Chemical Analysis pass
Labeling warning

Note: Although laboratory tests alone cannot be used to establish if coolant meets standards, they can be used to determine if it doesn't.

Physical Properties and Chemical Analysis  Autoguard
Percent Antifreeze, (Based on Percent Glycol) 50
Freeze Point, (ASTM D3321) in ⁰F -34
Bitterant, (ASTM D7704) in ppm 30
pH, (ASTM D1287) 10.77
Color, (Visual) Green
Ion Chromatography (ASTM D5827)  
Glycolate, ppm Not Detected
Formate, ppm Not Detected
Chloride, ppm 5
Sulfate, ppm Not Detected
Nitrite, ppm Not Detected
Nitrate, ppm 990
Phosphate, ppm 3,011