Mercedes-Benz has proposed a deal under which U.S. cars could be imported into Europe duty free in exchange for tariff waivers on the same number of vehicles that EU automakers export to the U.S.

“For every car that leaves the USA or Europe, a car from the other side comes in duty free,” Mercedes CEO Ola Kallenius told Spiegel magazine. “We have put this idea to both sides and it is a possible component of the negotiations between the USA and the EU.”

Such a deal could act as a precedent for other industries, Kallenius said.

Mercedes, and German rivals BMW and Volkswagen, are in talks with Washington over a possible import tariff deal, sources told Reuters last month.