Product Tested

front label

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back label

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PolyGuard Products Division

Company and Product Information

Corporate Office:
PolyGuard Products Division
Medina, MN 55340

Website(s): No Website Found



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.

PolyGUARD All Season
SAE 5W-30 Motor Oil

Product: PolyGUARD All Season
Viscosity Grade: SAE 5W-30
Labeling: API SF/CC

Marketed by: PolyGuard Products Division, Medina, MN

Purchased at: Ypsilanti, MI

Date of purchase: 11/15/2016


Website(s): No Website Found

Test Results and Assessment:

Advisory: The back label on this product states that it "meets API Service Category SF/CC." Consumers should be aware this is an OBSOLETE category for which the API states: "CAUTION: Not suitable for use in most gasoline-powered automotive engines built after 1988. May not provide adequate protection against build-up of engine sludge."  While the back label indicates the oil meets the requirements for vehicles prior to 1988, the labels fail to give adequate warning about its potential harm to more modern engines.


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 PolyGUARD
TBN, mg KOH/g (ASTM D2896) 5.41
Viscosity @ 100ºC, cSt (ASTM D445) 9.3 to <12.5 10.2
Viscosity @40ºC, cSt (ASTM D445) 60.9
Viscosity Index (ASTM D2270) 156
Viscosity @-30ºC mPa s (cP) (ASTM D5293) 6,600 Max 6,252
ELEMENTAL ANALYSIS (click for test details) - a, b
Calcium 1,801
Magnesium 4
Phosphorus, ppm   651
Zinc, ppm 717
Molybdenum,  ppm 46
Barium, ppm 0
Boron, ppm 0
Silicon, ppm 8
Potassium, ppm 2
Manganese, ppm 0
Titanium, ppm 0
Copper, ppm 0
Sodium, ppm 0
Vanadium, ppm 0
Silver, ppm 0
Aluminum, ppm 1
Chromium, ppm 0
Iron, ppm 0
Nickel, ppm 0
Lead, ppm 0
Antimony, ppm 1
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.