PETROLEUM QUALITY INSTITUTE OF AMERICA
The Data Speak for Itself...
Product Tested
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Best Parts, Inc.
Company and Product Information
Corporate Office:
Best Parts, Inc.
Memphis, TN, 38103
STP Pro Formula
SAE 15W-40 Diesel Motor Oil
Product: STP Pro Formula
Viscosity Grade: SAE 15W-40
Labeled: API CK-4/SN
Manufactured for and Distributed by Best Parts, Inc., Memphis, TN
Purchased at: Edison, NJ
Date of purchase: 6/26/2018
Website(s): www.stp.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.
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Physical Properties |  |
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| Elemental Analysis | |
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| Labeling | |
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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 | STP |
| TBN, mg KOH/g (ASTM D2896) | 10.08 | |
| Viscosity @ 100ºC, cSt (ASTM D445) | 12.5 to <16.3 | 15.2 |
| Viscosity @40ºC, cSt (ASTM D445) | 114 | |
| Viscosity Index (ASTM D2270) | 139 | |
| Viscosity @-20ºC mPa s (cP) (ASTM D5293) | 7,000 Max | 6,484 |
| ELEMENTAL ANALYSIS (click for test details) - a, b | ||
| Additives | ||
| Calcium, ppm | 1,047 | |
| Magnesium, ppm | 965 | |
| Phosphorus, ppm | 1,200 Max-c | 1,031 |
| Zinc, ppm | 1,134 | |
| Molybdenum, ppm | 59 | |
| Barium, ppm | <1 | |
| Boron, ppm | 2 | |
| Silicon, ppm | 4 | |
| Potassium, ppm | 2 | |
| Manganese, ppm | <1 | |
| Titanium, ppm | <1 | |
| Copper, ppm | <1 | |
| Sodium, ppm | <1 | |
| Vanadium, ppm | <1 | |
| Contaminants | ||
| Silver, ppm | <1 | |
| Aluminum, ppm | <1 | |
| Chromium, ppm | <1 | |
| Iron, ppm | <1 | |
| Nickel, ppm | <1 | |
| Lead, ppm | <1 | |
| Antimony, ppm | <1 | |
| Tin, ppm | <1 | |
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