| API GROUP | Sulfur % Wt. | Saturates % | Viscosity Index | typical applications | |
|---|---|---|---|---|---|
| Group I | > 0.03 | And/or | < 90 | 80-119 | Marine, industrial, process oils, older passenger car motor oils |
| Group II | ≤ 0.03 | And | ≥ 90 | 80-119 | Industrial, 10W-XX passenger car motor oils, 15W-XX heavy-duty diesel engine oils |
| Group III | ≤ 0.03 | And | ≥ 90 | ≥ 120 | 0W-XX and 5W-XX PCMO and HDMO |
| Group IV | 0.03 | All Polyalphaolefins (PAOs) | All Polyalphaolefins (PAOs) | All Polyalphaolefins (PAOs) | PCMO and industrial |
| Group V | All base stocks not in Group I-IV (naphthenics, non-PAO synthetics) | All base stocks not in Group I-IV (naphthenics, non-PAO synthetics) | All base stocks not in Group I-IV (naphthenics, non-PAO synthetics) | All base stocks not in Group I-IV (naphthenics, non-PAO synthetics) | Process oils, transformer oils, industrial lubricants, gear oils, transmission fluids, compressor oils, engine oils |
