Table 3, Octane Number Plug Coding
| Model | Engine | Part Number | Colour | Resistance | Engine Speed |
|---|---|---|---|---|---|
| CORSA, NOVA | C 12 NZ/C 14 NZ | 90 276 397 | black | 220 W | 830 to 990 rpm |
| KADETT - E, | C 14 NZ | 90 276 397 | black | 220 W | 830 to 990 rpm |
| ASTRA | |||||
| BELMONT | |||||
| CORSA, NOVA | C 12 NZ/C 14 NZ | 90 241 963 | yellow | 2.2 kW | 880 to 990 rpm |
| KADETT - E, | C 14 NZ | 90 241 963 | yellow | 2.2 kW | 930 to 990 rpm |
| ASTRA | |||||
| BELMONT |