Product Tested

front label

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back label

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Company and Product Information

Corporate Office:
1500 Vally Rd
Wayne, NJ 07470


Castrol is one of the world’s leading manufacturers and marketers of premium lubricating oils, greases, metalworking fluids, control fluids and related services to automotive,  manufacturing, mining, marine, and oil exploration and production customers across the world. Castrol employs over 7,500 people, it operates directly in more than 80 countries, and is represented by over 2,000 third party distributors. Part of the BP group, the company is headquartered in the UK. 

"The brand represents over 100 years’ experience in 'liquid engineering': producing advanced lubricants for a wide range of applications, from manufacturing processes and metalworking to mining, shipping and marine activities and energy production."


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.

Castrol Edge Full Synthetic
SAE 0W-20 dexos1

Product: Castrol Edge Full Synthetic
Viscosity Grade: SAE 0W-20
Labeling: API SN/ILSAC GF-5 dexos1

Marketed by: BP LUBRICANTS USA, INC., Wayne, NJ

Purchased at: Edison, NJ

Date of purchase: 12/28/2015


Website(s): www.castrol.com/us

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 Castrol Edge
TBN, mg KOH/g (ASTM D2896) 8.55
Viscosity @ 100ºC, cSt (ASTM D445) 6.9 to <9.3 8.42
Viscosity @40ºC, cSt (ASTM D445) 44.76
Viscosity Index (ASTM D2270) 167
Viscosity @-35ºC mPa s (cP) (ASTM D5293) 6,200 Max 5,537
Volatility, mass % loss, 1 hr, @ 250ºC (ASTM D5800) 15 Max -c 12.7
ELEMENTAL ANALYSIS (click for test details) - a, b
Calcium 2,295
Magnesium 8
Phosphorus, ppm 600 to 800 758
Zinc, ppm 817
Molybdenum,  ppm 82
Barium, ppm <1
Boron, ppm 384
Silicon, ppm 4
Potassium, ppm <5
Manganese, ppm <1
Titanium, ppm 7
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.