(October 15, 2019) HERNDON, Va. — Following the success and enthusiast fanfare of past generations, the A6 allroad makes its U.S. return in 2020 with a specially tuned adaptive air suspension and quattro with ultra technology. The A6 allroad is equipped with a turbocharged 3.0-liter V6 TFS engine that gives it the power to match the vehicle’s versatile character and distinctive design.