ChevronTexaco Corp. has filed a claim against former partner Petroecuador, demanding that the Ecuador-based state-owned company share expenses in a lawsuit accusing Texaco of polluting the Amazon jungle. The San Ramon-based oil company filed the request Friday with arbitrators at the American Arbitration Association in New York, company vice president and legal adviser Ricardo Reis Veiga said. "Based on the contract, Petroecuador has the shared obligation for ... whatever damages that could come out of this lawsuit," Reis Veiga said. "The decisions of the arbitrators cannot be appealed -- they are final and obligatory."