Product Tested

front label

Click above for larger image

back label

Click above for larger image

NAPA Auto Parts

Company and Product Information

Corporate Office:
NAPA Auto Parts
2999 Circle 75 Pkwy
AtlantaGA 30339-3050

Website(s): www.napaonline.com

NAPA was founded in 1925 to meet America's growing need for an auto parts distribution system. Today NAPA has grown to more than 6,000 NAPA AUTO PARTS stores, 62 distribution centers with more than 400,000 part numbers in inventory and more than 14,000 NAPA AutoCare and AutoCare Collision Centers nationwide.


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.

NAPA Premium Performance
SAE 20W-50 Motor Oil

Product: NAPA Premium Performance
Viscosity Grade: SAE 20W-50
Labeling: API SN

Manufactured for NAPA Distribution Centers by Ashland Inc., Covington, KY

Purchased at: Wray, CO

Date of purchase: 4/12/2016


Website(s): www.napaonline.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 NAPA
TBN, mg KOH/g (ASTM D2896) 6.41
Viscosity @ 100ºC, cSt (ASTM D445) 16.3 to <21.9 18.04
Viscosity @40ºC, cSt (ASTM D445) 165.52
Viscosity Index (ASTM D2270) 121
Viscosity @-15ºC mPa s (cP) (ASTM D5293) 9,500 Max 7,622
Volatility, mass % loss, 1 hr, @ 250ºC (ASTM D5800) 15 Max -c 4.6
ELEMENTAL ANALYSIS (click for test details) - a, b
Calcium 1,625
Magnesium 11
Phosphorus, ppm 600 to 800 743
Zinc, ppm 795
Molybdenum,  ppm <1
Barium, ppm <1
Boron, ppm 4
Silicon, ppm 4
Potassium, ppm <5
Manganese, ppm <1
Titanium, ppm <1
Copper, ppm <1
Sodium, ppm 449
Vanadium, ppm <1
Silver, ppm <1
Aluminum, ppm <1
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.