AGMA viscosity classification for gear oils and equivalent ISO VG

AGMA classifications and their equivalent ISO viscosity grades (ISO VG) for gear oils. Please note that EP, R&O and compound (C) designations are no longer used. It is therefore necessary to check the owner’s manual for service grade requirements.  Chart/table provided below for AGMA gear oils (lubricants) only. In order to check engine oil viscosity grades click SAE J300 along with SAE J306 for gear oil.

Former AGMA viscosity classification for gear oils. For example, AGMA 5 gear oil viscosity is equal to ISO VG 220
Former AGMA
lubricant #
Kinematic viscosity cSt @40°C Equivalent
ISO VG
Min Max
0 28.8 35.2 32
1 41.4 50.6 46
2, 2 EP 61.2 74.8 68
3, 3 EP 90 110 100
4, 4 EP 135 165 150
5, 5 EP 198 242 220
6, 6 EP 288 352 320
7 C, 7 EP 414 506 460
8 C, 8 EP 612 748 680
8A C, 8 EP 900 1,100 1,000
9 1,350 1,650 1,500
10 1,980 2,420 2,200
11 2,880 3,250 3,200

Please note that EP, R&O and C (compound) designations are no longer used.

References:

AGMA 9005-D94

ISO VG Viscosity Classifications