Product Tested

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Best Parts. Inc.

Company and Product Information

Corporate Office:
Best Parts, Inc.
Memphis, TN 38103



According to their website... "Armored AutoGroup Inc., headquartered in Danbury, Conn., is primarily comprised of the Armor All® and STP® brands. The current Armor All product line of protectants, wipes, tire and wheel care products, glass cleaners, leather care products and washes is designed to clean, shine and protect interior and exterior automobile surfaces. The STP product line of oil and fuel additives, functional fluids and automotive appearance products has a broad customer base ranging from professional racers to car enthusiasts and “Do-it-Yourselfers”.

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.

Automatic Transmission Fluid

Automatic Transmission Fluid

Distributed By: Best Part, Inc., Memphis, TN

Purchased at: Edison, NJ

Date of purchase: 6-10-2016


Website(s): www.stp.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 STP
Flash Point in ºC (ASTM D92) 170/177 Min-c 213
Viscosity @ 100ºC, cSt (ASTM D445) 6.8 Min 7.3
Viscosity @40ºC, cSt (ASTM D445) 35.3
Viscosity Index (ASTM D2270) 178
Brookfield Viscosity @-40ºC mPa s (cP) 20,000 Max 19,680
ELEMENTAL ANALYSIS (click for test details) - a, b
Calcium 140
Magnesium 1
Phosphorus, ppm 240
Zinc, ppm 31
Molybdenum,  ppm 0
Barium, ppm 0
Boron, ppm 99
Silicon, ppm 3
Potassium, ppm 2
Manganese, ppm 0
Titanium, ppm 0
Copper, ppm 0
Sodium, ppm 11
Vanadium, ppm 0
Silver, ppm 2
Aluminum, ppm 0
Chromium, ppm 0
Iron, ppm 2
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.