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SAE Viscosity Grades for Engine Oils

Source: all about Motor Oil - web http://motorcycleinfo.calsci.com/Oils1.html
Source, Understanding the SAE Motor Oil Viscosity Standard - www.ideas4ag-ed.corn
Note:    Straight Weights eg 10 20 30 40 50 60 are different than W grades eg 5W 10VV 20W
SAE Viscosity Grades for Engine Oils

 

the following tests are run in a viscosity measuring bath type apparatus - we have this - as per ASTM - D445 - vertical flow

cP = centipoise - mPa.s = milli Pascal-second - measured by Rheometer

Grade

 

Kinematic viscosity (cSt) Low Shear Rate at 1000C

 

Dynamic Viscosity (mPa.$) High Shear Rate at 150C

20

From 5.6 To 9.3 cST at 100c

2.6 cP at 150c

30

From 9.3 To 12.5 cST at 100c

2.9 cP at 150c

40a

From 12 5 To 16.3 cST at 100c

2.9 cP at 150c

40b

From 12.5 To 16.3 cST at 100c

3.7 cP at 150c

50

From 163 To 219 cST at 100c

3.7 cP at 150c

60

From 21 9 To 261 cST at 100c

37 cP at 150c

A

Ow-40. 5w-40, 10w-40 grades

 

B

15w-40, 20w-40, 25w-40, 40 grades

 

  • Winter Grades are designated by W after the number – eg 20W

The following tests are run in a special test apparatus called – cold cranking simulator (CCS)


SAE J300 (1999) Motor Oil Grades - Low Temp. Specifications

Dynamic Viscosity (mPa.s)

Grade

Cranking

Cranking Maximum

Pumping maximum

0W

3,250cP at -30c

6.200 at -35c

60,000cP at -40c

5W

3,5000P at -25c

6,600 at -30c

60.000cP at -35c

10W

3,500cP at -20c

700001 -25c

60.000cP at -30c

15W

3,500cP at -15c

7,000 at -200

60,000cP at -25c

20W

4.500cP at -10c

9,500 at -15c

60,000cP at -20c

25W

6,000cP at -Sc

13,000 at -10c

60 000P at -15c

 

Oldest Specs. - SAE J300 (1911 ca.) Motor Oil Specifications

SAE Grade

Flow Rate at 100 C

Notes:

10

0=14 Seconds

SAE started grading motor oil in 1911

20

15 To 24 Seconds

movement of different layers of fluid were

30

25 to 34 Seconds

measured when subjected to a horizontal

40

35 to 44 Seconds

force - 5 grades were identified

50

'=45 Seconds

SAE 60 was added later to the list


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