| Model | Engine | Year | Standard Plug | Gap (mm) | Iridium Power | Iridium Tough |
|---|---|---|---|---|---|---|
| EN222A | 18mm Heads | M14 | 0.6 | |||
| EN248, EN256 | Â | M14 | 0.6 | |||
| EN257A, EN257C | Â | M22 | 0.7 | |||
| EN271, EN272 | Â 14mm Heads | W20FSU | 0.6 | IWF22 | ||
| EN271, EN272 | Â 18mm Heads | M14 | 0.6 | |||
| EN275, EN277 | Â 14mm Heads | W20FSU | 0.6 | IWF22 | ||
| EN275, EN277 | Â 18mm Heads | M14 | 0.6 | |||
| F227 | Â | M14 | 0.6 | |||
| FT3, FT7, F227 | Â 6 Cyl., 4 Cyl. | M14 | 0.6 |