BMW may have to fund the cost of scrapping old Rover-badged cars.
The European Union's end of life vehicle directive will make automakers legally responsible for recycling cars manufactured under their name.
When BMW sold the Rover group in 2000, the German carmaker retained ownership of the Rover and Triumph nameplates.
Now that MG Rover has collapsed, does that give BMW responsibility for those marques under the EU directive?
"We are monitoring the situation, but we don't have a conclusion," said a BMW spokesperson.
"The industry may have to take a collective view," said Christopher Macgowan, chief executive of the UK Society of Motor Manufacturers and Traders.
"No one imagined a major company would go out of business when the legislation was drawn up."
In the UK an estimated 2.3 million cars produced by MG Rover and its predecessors - such as BMC, British Leyland, BL - are still in circulation.
They include models badged Austin, Austin-Healey, Morris, MG, Riley, Rover, Standard, Triumph and Wolseley. Ford owns Jaguar and Land Rover, which were once part of Rover.