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Two owners of diesel-powered General Motors vehicles are accusing the car maker of producing an engine that exceeds U.S. standards for pollutant emissions under normal driving conditions, in a lawsuit that targets more than 700,000 Chevrolet Silverado and GMC Sierra Truck Models equipped with 6.6L Duramax Diesel Engines. The class-action lawsuit accuses GM of using “at least three separate ‘defeat devices’ to increase engine power and efficiency” in its Duramax…