Product Tested

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Circle K Stores Inc.

Company and Product Information

Corporate Office:
Cirlce K Stores Inc.
Tempe, AZ

Website(s): www.circlek.com

Circle K is an international chain of convenience stores, founded in 1951, in El Paso, TX. It is owned and operated by the Canadian-based Alimentation Couche-Tard, which is one of the largest company-owned convenience store operators in the world with more than 16,000 stores across Canada, the United States, Europe, Mexico, Japan, China, and Indonesia. The company operates its corporate stores under mainly Couche-Tard, Mac’s, Circle K, On the Run and also under the affiliated brands 7-jours, Dairy Mart, Daisy Mart and Winks.

Automatic Transmission Fluid


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.

Circle K

Circle K

Distributed By: Circle K Stores Inc., Tempe, AZ
Manufactured By: Pinnacle Oil, Indianapolis, IN

Purchased at: Venice, FL

Date of purchase: 8/26/2016


Website(s): www.circlek.com

Test Results and Assessment:

The results of the tests conducted on this sample meet the requirements for Dexron III/Mercon.

bottle icon Physical Properties pass
Elemental Analysis pass
Labeling pass

Note: Although the laboratory tests conducted cannot alone be used to establish if an Automatic Transmission Fluid meets all of its labeled specifications, they can be used to determine if it doesn't.

PHYSICAL TESTS (click for test details) - a Standard Circle K
Flash Point in ºC (ASTM D92) 170/177 Min-c 203
Viscosity @ 100ºC, cSt (ASTM D445) 6.8 Min 7.3
Viscosity @40ºC, cSt (ASTM D445) 35.7
Viscosity Index (ASTM D2270) 175
Brookfield Viscosity @-40ºC mPa s (cP) 20,000 Max 15,920
ELEMENTAL ANALYSIS (click for test details) - a, b
Calcium 10
Magnesium 0
Phosphorus, ppm 153
Zinc, ppm 3
Molybdenum,  ppm 0
Barium, ppm 0
Boron, ppm 62
Silicon, ppm 1
Potassium, ppm 0
Manganese, ppm 0
Titanium, ppm 0
Copper, ppm 0
Sodium, ppm 1
Vanadium, ppm 0
Silver, ppm 0
Aluminum, ppm 0
Chromium, ppm 0
Iron, ppm 0
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. Dexron® III, 170°C minimum, Mercon®, 177 °C minimum.