Table 3, Octane Number Plug Coding
| Model | Engine | Parts Number | Colour | Title | Resistance | Idle Speed |
|---|---|---|---|---|---|---|
| VECTRA/ | C 18 NZ | |||||
| CAVALIER | MT-5 | 95/91 | 220/0 W | 800 - 960 rpm | ||
| VECTRA/ | C 18 NZ | |||||
| CAVALIER | AT-4 | 90 276 397 | black * | 95/91 | 220/0 W | 750 - 910 rpm |
| KADETT-E | C 18 NZ | |||||
| ASTRA/ | MT-5 | 95/91 | 220/0 W | 800 - 960 rpm | ||
| BELMONT |
* A yellow octane number plug is available as a field remedy. Engine speed increase approx. 100 rpm.