Product Tested

front label

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back label

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Company and Product Information

Corporate Office:
100 Mission Ridge
Goodlettsville, TN 37072




The Petroleum Quality Institute of America (PQIA) is an independent resource for information and insights on the quality of lubricants in the marketplace. Our mission is to serve the consumer of lubricants by randomly sampling and independently testing lubricants taken from the field. Test results are posted along with the brand names on the PQIA website. This webpage provides an analysis on the brand detailed below.

The following are the test results for the sample examined.

Dollar General Auto
Motor Oil 10W-40

Product: Dollar General Auto
Viscosity Grade: SAE 10W-40
Labeling: API SF

Marketed by: DOLGENCORP, LLC.

Purchased at: Perth Amboy, NJ

Date of purchase: 6/17/2015


Website(s): www.dollargeneral.com

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.

NOTE: The front label on this product says "Lubricates and protects your engine". Perhaps if your engine is more than 26 years old, but it's ability to protect more modern engines is questionable. The back label lists this product as API SF which is an obsolete specification not intended for engines built after 1988 and is considered by the API as unsuitable for most gasoline engines built thereafter. To their credit, the back label includes a cautionary statement about the product's limited use.

bottle icon Physical Properties pass
Elemental Analysis pass
Labeling warning

Note: 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.

PHYSICAL TESTS (click for test details) - a Standard Dollar General
TBN, mg KOH/g (ASTM D2896) 6.24
Viscosity @ 100ºC, cSt (ASTM D445) 12.5 to <16.3 14.8
Viscosity @40ºC, cSt (ASTM D445) 93.8
Viscosity Index (ASTM D2270) 165
Viscosity @-25ºC mPa s (cP) (ASTM D5293) 7,000 Max 4,375
ELEMENTAL ANALYSIS (click for test details) - a, b
Calcium 2004
Magnesium 5
Phosphorus, ppm   675
Zinc, ppm 736
Molybdenum,  ppm 48
Barium, ppm 0
Boron, ppm 18
Silicon, ppm 7
Potassium, ppm 1
Manganese, ppm 0
Titanium, ppm 0
Copper, ppm 0
Sodium, ppm 4
Vanadium, ppm 0
Silver, ppm 1
Aluminum, ppm 0
Chromium, ppm 0
Iron, ppm 1
Nickel, ppm 0
Lead, ppm 0
Antimony, ppm 0
Tin, ppm 0
  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 two significant figures, therefore results up to 15.5 are considered on specification.