Product Tested

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CST Brands, Inc

Company and Product Information

Corporate Office:
CST Brands, Inc
One Valero Way
San Antonio, TX 78240

Website(s): www.cstbrands.com

About CST Brands, Inc.
CST Brands, Inc., a Fortune 500 Company, is one of the largest independent retailers of motor fuels and convenience merchandise in North America. Based in San Antonio, Texas, CST employs over 14,000 Team Members at over 2,000 locations throughout the Southwestern United States, Georgia, Florida, New York and Eastern Canada offering fuel and a broad array of convenience merchandise, beverages, snacks and fresh food. CST also owns the general partner of CrossAmerica Partners LP, a master limited partnership and wholesale distributor of fuels, based in Allentown, Pennsylvania.


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.

Valero Premium
SAE 10W-40 Motor Oil

Product: Valero Premium
Viscosity Grade: SAE 10W-40
Labeling: API SN

Manufactured for: CST Brands, Inc., San Antonio, TX

Purchased at: Cheyenne, WY

Date of purchase: 4/11/2016


Website(s): www.cstbrands.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.

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 Valero
TBN, mg KOH/g (ASTM D2896) 7.27
Viscosity @ 100ºC, cSt (ASTM D445) 12.5 to <16.3 14.77
Viscosity @40ºC, cSt (ASTM D445) 103.89
Viscosity Index (ASTM D2270) 148
Viscosity @-25ºC mPa s (cP) (ASTM D5293) 7,000 Max 6,975
Volatility, mass % loss, 1 hr, @ 250ÂșC (ASTM D5800) 15 Max -c 12.6
ELEMENTAL ANALYSIS (click for test details) - a, b
Calcium 1,712
Magnesium 6
Phosphorus, ppm 600 Min 779
Zinc, ppm 842
Molybdenum,  ppm <1
Barium, ppm <1
Boron, ppm 4
Silicon, ppm 5
Potassium, ppm <5
Manganese, ppm <1
Titanium, ppm <1
Copper, ppm <1
Sodium, ppm 460
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 two significant figures, therefore results up to 15.5 are considered on specification.