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Is there any reason why there's a Vauxhall brand even though they're just Opels underneath?
You could also ask "Why is there a Pontiac brand if they are just Chevys underneath"
The same could be said about Dodge and Plymouth, which was even worse. And the answer to your question was the discontinuation of the Plymouth brand in 2001
Though I suppose there is a difference, since at least Chevy and Pontiac and Dodge and Plymouth were all sold in the same place, which is not true for Opel/Vauxhall