Petroleum Quality Institute of America

The Petroleum Quality Institute of America (PQIA) is an independent resource for information and insights on the quality and performance of lubricants in the marketplace.  Our mission is to serve the consumer of lubricants by reporting on the quality and integrity of lubricants in the marketplace.   

 

 

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SAE Viscosity Chart (High Temp)
100 C (210 F)
SAE Viscosity Kinematic (cSt) Kinematic (cSt)
  100 C Min 100 C Max
8 4.0 <6.1
12 5.0 <7.1
16 6.1 <8.2
20 6.9 <9.3
30 9.3 <12.5
40 12.5 <16.3
50 16.3 <21.9
60 21.9 <26.1
Source: Engine Oil Viscosity Classification, J300 Jan2015, SAE. The full publication is available from SAE at www.sae.org.
 
 
In The Market (5W-30)
 

VISCOSITY @100˚C

As shown in the graph below, the average viscosity for the 5W-30 major brands tested is 10.4 cSt @100C. Also important to note there is a relatively tight range as to where the viscosities @100C of the majors fall. All are skewed to the lower end of the acceptable API range.

 

 
VISCOSITY @40˚C

As shown in the graph below, the average viscosity for the 5W-30 major brands tested is 61.1 cSt @40C. As with the range of viscosities among the majors at 100C, there is a relatively tight range as to where the viscosities @40C falls. All are skewed to the lower end of the acceptable API range.

For details on ASTM D445 test method click here.

 

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