Opel is part of the Stellantis Group. The Stellantis was created by a merger between FCA and PSA. Citroen back than was part of PSA. You’re right that the platform an which the Corsa, Astra etc is based on is French but it’s a PSA developed platform and not developed by Citroen. 1. AccidentalNordlicht.
In petrol form, it’s great. The new Astra’s body is 14% more rigid than the old car which means the chassis doesn’t flex as much when you throw it at a corner – and that makes the tyres
633BNR.