Find this 1976 Opel by Isuzu offered for $1200 in San Antonio, TX via craigslist.. Tip from FuelTruck and words by Hunsbloger: As an Opel fan these were the worst. By the end of 1975 the fuel injected, swim deck bumpered Opel Manta Luxus had effectively priced itself out of competition in the US. The DM was up and the Dollar was down. It was killing the US manufacturer's ability to import their way into the small car market. The Capri was similarly impacted by the same currency challenge.