Product Tested

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Black Knight Products

Company and Product Information

Corporate Office:
Jasper, TX

Website(s): No Websites Found for Black Knight Products



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.

Black Knight Motor Oil

Product: Black Knight
Viscosity Grade: 20-50
Labeling: API SB/CB

Marketed by: Black Knight Products, Jasper, TX
BLACK KNIGHT is a registered trademark of Smitty's Supply, Inc., Roseland, LA

Purchased at: Washington, D.C.

Date of purchase: 7/1/2015


Website(s): No Websites Found For Black Knight Products

Test Results and Assessment:


The label on this product states "Recommended for Pre-1988 Gasoline and Diesel Engines Requiring SB/CB Motor Oil". The only gasoline engines requiring SB motor oils are actually pre-1952, and diesel engines requiring CB motor oils are pre-1962. These are obsolete specifications and may cause harm in modern engines. The label on this product fails to give adequate warning to consumers about its limited use. The organometallic additive levels in this sample indicate the product is NOT suitable for use in the majority of automobile engines currently on the road, and the unusually high silicon level in this sample indicates the product may be contaminated with abrasive material. Furthermore, the viscosity grade is misstated on the labels and should be shown as SAE 20W-50. The labels show 20-50 which has no meaning.  Further, as an editorial comment, the last sentence in the warning on the back label, "Oil soiled clothing should," is incomplete.


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 Black Knight
TBN, mg KOH/g (ASTM D2896) 2.56
Viscosity @ 100ºC, cSt (ASTM D445) 16.3 to <21.9 16.9
Viscosity @40ºC, cSt (ASTM D445) 130
Viscosity Index (ASTM D2270) 141
Viscosity @-15ºC mPa s (cP) (ASTM D5293) 9,500 Max 4,208
ELEMENTAL ANALYSIS (click for test details) - a, b
Calcium 601
Magnesium 28
Phosphorus, ppm   237
Zinc, ppm 268
Molybdenum,  ppm 19
Barium, ppm 0
Boron, ppm 28
Silicon, ppm 19
Potassium, ppm 6
Manganese, ppm 0
Titanium, ppm 0
Copper, ppm 0
Sodium, ppm 9
Vanadium, ppm 0
Silver, ppm 0
Aluminum, ppm 1
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. This specification is expressed to two significant figures, therefore results up to 15.5 are considered on specification.