Product Tested

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Royal Purple, LLC

Company and Product Information

Corporate Office:
Royal Purple, LLC
One Royal Purple Lane
Porter, TX 77365


According to Royal Purple's Website: "Royal Purple located in Porter, Texas, produces a wide range of high performance lubricants for nearly every consumer and industrial application. Royal Purple’s founder John Williams was a pioneer in the development of high performance synthetic lubricants and collectively, Royal Purple’s formulators have more than 200 years of expertise in developing high performance lubricants. Royal Purple’s sole mission is to develop products that significantly outperform other synthetic and mineral based oils. Royal Purple was acquired in 2012 by Calumet Specialty Products Partners (CLMT), a leading refiner and processor of specialty hydrocarbon products headquartered in Indianapolis, IN."


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.

Royal Purple Synthetic Oil SAE 5W-20
High Performance Motor Oil

Product: Royal Purple Synthetic
Viscosity Grade: SAE 5W-20
Labeling: API SN/ILSAC GF-5

Manufactured By: Royal Purple, Porter, TX

Purchased at: Sidney, NE

Date of purchase: 4/12/2016


Website(s): www.royalpurple.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.

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 Royal Purple
TBN, mg KOH/g (ASTM D2896) 7.98
Viscosity @ 100ºC, cSt (ASTM D445) 6.9 to <9.3 8.59
Viscosity @40ºC, cSt (ASTM D445) 48.85
Viscosity Index (ASTM D2270) 154
Viscosity @-30ºC mPa s (cP) (ASTM D5293) 6,600 Max 5,019
Volatility, mass % loss, 1 hr, @ 250ºC (ASTM D5800) 15 Max -c 10.4
ELEMENTAL ANALYSIS (click for test details) - a, b
Calcium 2,160
Magnesium 8
Phosphorus, ppm 600 to 800 748
Zinc, ppm 813
Molybdenum,  ppm 79
Barium, ppm <1
Boron, ppm 253
Silicon, ppm 3
Potassium, ppm <5
Manganese, ppm <1
Titanium, ppm <1
Copper, ppm <1
Sodium, ppm <5
Vanadium, ppm <1
Silver, ppm <1
Aluminum, ppm 2
Chromium, ppm <1
Iron, ppm <1
Nickel, ppm <1
Lead, ppm <1
Antimony, ppm <1
Tin, ppm <1
  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.