BERLIN (Reuters) -BMW is considering adding shifts to its Spartanburg plant in South Carolina to boost output by up to 80,000 units, executives said on an analyst call on Thursday, as carmakers brainstorm ways to appease the Trump administration and ward off a mounting trade war.

The premium carmaker had around 30 days' worth of inventory in the United States as well as some stocks and components, and would keep prices stable on most U.S. models until the end of May, executives told analysts, according to a note on the call by Bernstein Research.

The investor call was held before a closed period on company information before annual results scheduled for May 7.

BMW did not immediately respond to a request for comment.

The carmaker's Spartanburg plant, which exports around half of the vehicles it makes to customers outside the United States, is located in a free-trade zone.

That meant that parts imported by BMW for vehicles destined for export were exempt from tariffs, executives said, providing some relief, according to the note.