| User type | Recommended? | Notes | |-----------|--------------|-------| | | ✅ Yes (7zap) | Great for finding part numbers before ordering online | | Professional shop | ⚠️ Partially | Unofficial is risky; official is expensive but reliable | | Parts seller | ✅ Yes | Must have EPC for cross-referencing | | Classic Opel owner | ✅ Yes | Good for 1980s–2000s models | | New Opel owner (2020+) | ❌ No | Need dealer or paid ECAT |