Rebadged cars aren't a problem. That happened for ages(Volvo-Peugeot-Renault V6 engine that ended up in DeLorean's Inox car or FIAT-SEAT, or Peugeot-Citroen or SIMCA 1307/1308-Chrysler 150 that you'd always call it Talbot Alpine in UK ). The main issue nowadays is when they try to sell it as a game-breaking new piece of state of the art car only after the name, not the car: The new Supra would be a great "shared enterprise" if it was simply named Celica. Just like honda's Type S line, they write "Type", they remove the R, and charge you the money for the S...Their new owners will never build anything sketched by Vauxhalls team anyway just cheap rebadged euro boxes with little style.
ISUZU in quotes, because in the 90s the brand was the main manufacturer of diesel engines in Japan, and Opel bought part of the plant so that they would exclusively manufacture bte engines for them, that the designs for no one else would not come out, that's why they are isuzu, but they are exclusive to opel, but it is that they manufacture an engine and if opel gives 200 euros and seat they also give it to both