SAE j306 viscosity classification (Revised SAE J306)
Automotive gear lubricant viscosity classification (SAE J306) has been revised. Effective February 2019, the revised SAE J306 standard now includes low viscosity grades. Lighter lubricants for future automotive gear oils. For engine oil viscosity classification SAE j300 viscosity chart click this link.
Revised SAE J306
A new standard for automotive gear lubricants is an important factor towards the drive for greater fuel economy. Revised SAE J306 is economical as well as a help to reduce greenhouse gas emissions. Lowering the current viscosity limit to 3.8 cSt at 100°C will allow design of modern hardware with greater operating efficiency.
Revised SAE J306 standard now includes 3 new viscosity grades:
- SAE 65
- SAE 70
- and SAE 75
Revised lower Viscosity limits for SAE 70W, 75W, and SAE 80W.
SAE J306 viscosity chart. Revised and updated, effective February 2019 SAE J306 viscosity table.
| SAE viscosity grade |
Maximum
temperature for a viscosity of 150,000 cP[1] |
Kinematic viscosity @100°C | |
|---|---|---|---|
| Min[2] | Max | ||
| 70W | -55°C | 3.8 | – |
| 75W | -40°C | 3.8 | – |
| 80W | -26°C | 8.5 | – |
| 85W | -12°C | 11.0 | – |
| 65 | – | 3.8 | <5.0 |
| 70 | – | 5.0 | <6.5 |
| 75 | – | 6.5 | <8.5 |
| 80 | – | 8.5 | <11.0 |
| 85 | – | 11.0 | <13.5 |
| 90 | – | 13.5 | <18.5 |
| 110 | – | 18.5 | <24.0 |
| 140 | – | 24 | <32.5 |
| 190 | – | 32.5 | <41.0 |
| 250 | – | 41.0 | – |
References:
[1] Using ASTM D2983 Standard Test Method for Low-Temperature Viscosity