- GM had Opel, and it was clearly labeled as Opel - GM. GM was not on the car, but was on all docs and ads.
Don't be so sure! I had a '21 Vauxhall Insignia (basically a Buick Regal but with a tiny 3 cylinder diesel engine) which was the very last GM car sold in the UK by Vauxhall after they got sold to Stellantis. While yes, there was Vauxhall badges on the steering wheel, exterior and keys, all the parts had a GM logo somewhere on them. A lot of them quite visible such as windows, boot struts, inside the fuel filler cap etc.
Good car, spoiled by a poor engine. The 1.5 3 cylinder diesel engine was half of a 3.0 Duramax and it vibrated and rattled the car to pieces.