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 Motor Oil
Viscosity Grade: 10-30
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 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 10W-30. The labels show 10-30 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) 2.72
Viscosity @ 100ºC, cSt (ASTM D445) 9.3 to <12.5 9.5
Viscosity @40ºC, cSt (ASTM D445) 61.6
Viscosity Index (ASTM D2270) 136
Viscosity @-25ºC mPa s (cP) (ASTM D5293) 7,000 Max 6670
ELEMENTAL ANALYSIS (click for test details) - a, b
Calcium 604
Magnesium 35
Phosphorus, ppm   257
Zinc, ppm 247
Molybdenum,  ppm 25
Barium, ppm 0
Boron, ppm 25
Silicon, ppm 22
Potassium, ppm 4
Manganese, ppm 0
Titanium, ppm 0
Copper, ppm 0
Sodium, ppm 18
Vanadium, ppm 0
Silver, ppm 0
Aluminum, ppm 1
Chromium, ppm 0
Iron, ppm 1
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.