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In page Opel Manta:

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With the Deutsche mark becoming stronger, and with other costs also rising, U.S. imports of Opels ended in 1975. Instead, the Isuzu Gemini version of the T-car was imported from Japan and sold by Buick dealers as the "Opel by Isuzu", and later, "Buick Opel". The Opel name was last used in the U.S. in 1979.[1]