Product Tested

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Warren Oil Company, Inc.

Company and Product Information

Corporate Office:
Warren Oil Company, Inc
2340 US-301
Dunn, NC 28334


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.

SAE 15W-40 Synthetic Blend Heavy Duty Diesel Engine Oil

Viscosity Grade: SAE 15W-40
Labeled: API CK-4/SN

Manufactured by: Warren Oil Company, Inc, Dunn, NC

Purchased at: Pelzer, SC

Date of purchase: 7/26/2018



Test Results and Assessment:

The results of the tests conducted on this sample meet the SAE J300 specifications for the SAE Viscosity Grade listed on the product label, and are consistent with the listed API Service Categories.


bottle icon Physical Properties pass
Elemental Analysis pass
Labeling warning
Viscosity @ 100°C, cSt (ASTM D445)

The results of the Kinematic Viscosity @ 100ºC test conducted on this sample meet the requirements of SAE J300.
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Cold Cranking Viscosity, mPa s (cP) (ASTM D5293)

The results of the Cold Cranking Viscosity test conducted on this sample meet the requirements of SAE J300.
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Phosphorus, ppm (ASTM D5185)

The results of the Phosporus test conducted on this sample meet the requirements of API CK-4/SN.
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Note1: Although laboratory tests alone cannot be used to establish if engine oil meets an API Service Category, they can be used to determine if it doesn't. Note2: The specification for cold cranking viscosity includes only a maximum value; the minimum value shown in the “standard” area of the chart is truncated for illustrative purposes.

PHYSICAL TESTS (click for test details) - a Standard LUBRIGUARD
TBN, mg KOH/g (ASTM D2896) 9.43
Viscosity @ 100ºC, cSt (ASTM D445) 12.5 to <16.3 15.1
Viscosity @40ºC, cSt (ASTM D445) 111
Viscosity Index (ASTM D2270) 142
Viscosity @-20ºC mPa s (cP) (ASTM D5293) 7,000 Max 5,177
ELEMENTAL ANALYSIS (click for test details) - a, b
Calcium, ppm 1,044
Magnesium, ppm 937
Phosphorus, ppm 1,200 Max-c 976
Zinc, ppm 1,077
Molybdenum,  ppm 57
Barium, ppm <1
Boron, ppm 2
Silicon, ppm 4
Potassium, ppm <1
Manganese, ppm <1
Titanium, ppm <1
Copper, ppm <1
Sodium, ppm <1
Vanadium, ppm <1
Silver, ppm <1
Aluminum, ppm <1
Chromium, ppm <1
Iron, ppm <1
Nickel, ppm <1
Lead, ppm <1
Antimony, ppm <1
Tin, ppm <1
  1. Standards, shown in yellow are established by API, SAE and others.
  2. Test Method for metal analysis is ASTM D5185.
  3. This specification is expressed to one significant figure, therefore results up to 1,249 are considered on specification.