Viscosity Alarm Bands for ISO VG Industrial Fluids
| Alert | Caution | Marginal | ISO VG | Marginal | Caution | Alert |
| -15% | -10% | -5% | Nominal | 15% | 20% | 25% |
| 1.7 | 1.8 | 1.9 | 2 | 2.3 | 2.4 | 2.5 |
| 8.5 | 9 | 9.5 | 10 | 11.5 | 12 | 12.5 |
| 10.2 | 10.8 | 11.4 | 12 | 13.8 | 14.4 | 15 |
| 12.75 | 13.5 | 14.25 | 15 | 17.25 | 18 | 18.75 |
| 18.7 | 19.8 | 20.9 | 22 | 25.3 | 26.4 | 27.5 |
| 27.2 | 28.8 | 30.4 | 32 | 36.8 | 38.4 | 40 |
| 39.1 | 41.4 | 43.7 | 46 | 52.9 | 55.2 | 57.5 |
| 57.8 | 61.2 | 64.6 | 68 | 78.2 | 81.6 | 85 |
| 85 | 90 | 95 | 100 | 115 | 180 | 187.5 |
| 187 | 198 | 209 | 220 | 253 | 264 | 275 |
| 272 | 288 | 304 | 320 | 368 | 384 | 400 |
| 391 | 414 | 437 | 460 | 529 | 552 | 575 |
| 578 | 612 | 646 | 680 | 782 | 816 | 850 |
| 850 | 900 | 950 | 1000 | 1150 | 1200 | 1250 |
| 1275 | 1350 | 1425 | 1500 | 1725 | 1800 | 1875 |
SAE Grade Viscosity Ranges for Engine Oils
| Min. @100C | SAE Grade | Max@100C |
| 3.8 | 5W | |
| 4.1 | 10W | |
| 5.6 | 15W | |
| 5.6 | 20W | |
| 9.3 | 25W | |
| 5.6 | 20 | <9.3 |
| 9.3 | 30 | <12.5 |
| 12.5 | 40 | <16.3 |
| 16.3 | 50 | <21.9 |
| 21.9 | 60 | <26.1 |