I saw the new version of the Trans Sport called Montana or Trans Sport, with the Pontiac badge in North America. In Europe it's sold as Chevrolet Trans Sport.
Is the Oldsmobile Silhouette and the Opel Sintra still sold in another country ?

The Pontiac Trans Sport became the Montana a few years ago. In a few export markets, it is sold as the Chevrolet Trans Sport and the Oldsmobile Silhouette was exported at one time.

The Opel/Vauxhall Sintra ended production a few years back. It was never a big seller, so it was killed in favor of the Zafira.