--Fiat CEO Sergio Marchionne says company will address its "European challenge" in third-quarter results

--Carlos Ghosn, CEO of Renault and Nissan, says status quo in the European auto sector is "unsustainable"

--"We are not planning on a quick recovery," says GM's chief economist

The chief executives of Renault SA (RNO.FR) and Fiat SpA (FIATY, F.MI) on Friday said European auto makers must take more, painful restructuring measures soon as sales in the economically troubled euro zone head into a long-term slump.

"Something needs to give," Fiat CEO Sergio Marchionne said Friday in Detroit. "You cannot maintain the same operating structure you had before." Mr. Marchionne said Fiat will address the issue of "how we'll deal with the European challenge" when it releases third-quarter results later this year. Fiat closed a European factory in 2010.

Carlos Ghosn, chief executive of French auto maker Renault and Japan's Nissan Motor Co. (NSANY, 7201.TO), said in an interview with The Wall Street Journal in Tokyo Friday morning that the status quo in the European auto sector is "unsustainable." He predicted governments ultimately will allow companies to overhaul themselves to survive.

"There's going to be more restructuring," Mr. Ghosn said. "Everyone is going to do it following his own agenda. I don't think it's possible for anyone to oppose this." Mr. Ghosn said the response so far from government officials "has been very realistic."

Three of Europe's most-ailing mass market auto makers, France's PSA Peugeot Citroen SA (PEUGY, UG.FR), Ford Motor Co.'s (F) Ford of Europe, and General Motors Co.'s (GM) Opel unit, are pushing ahead with plans to cut at least 15,000 jobs at factories in France, Belgium and Germany, respectively. Ford and GM haven't outlined their plans formally, but people familiar with their operations say the companies are likely to close one large European plant each.

Renault on Thursday said it will cut temporarily a shift of small-car production at a factory in Slovenia that employs about 2,000 workers. Renault, in which the French government maintains a controlling stake, last closed a French factory in 1992 and hasn't disclosed large-scale cuts to respond to the current market slump.

The French government earlier this week issued a report suggesting it won't block Peugeot's plans to cut as many as 8,000 manufacturing jobs. But French Industry Minister Arnaud Montebourg said on French radio Thursday that the Peugeot plan was "unacceptable" and called for a "narrowing of its scale," Dow Jones Newswires reported.

The euro-zone economic crisis is undercutting consumer demand for vehicles across Western Europe. European car sales are down nearly 7% through the first half of 2012, according to the European Automobile Manufacturers Association, a trade group. What is driving European industry executives' decisions isn't so much the short-term slump but a judgment that sales in the region will decline and stay depressed for a long time.

"Anytime you have a sovereign debt crisis it's going to take a long time to recover," GM chief economist Mustafa Mohatarem said Friday. "We are not planning on a quick recovery."

On Friday, German auto maker Volkswagen AG (VLKAY, VOW.XE) said its sales in Western Europe outside of Germany have fallen 5.8% for the year through the end of August, although deliveries in Germany are up 4.1%.

"We are monitoring the continued tense situation, particularly in Western Europe, very closely," said Christian Klingler, board member for sales at Volkswagen.

VW's aggressive moves to gain market share at the expense of weaker European rivals have prompted cries of foul from Mr. Marchionne. The Fiat CEO has called on the European Union "to try to provide some stewardship in this process" rather than let the German, French and Italian governments battle to protect their respective national champions.

Friday, Mr. Marchionne appeared to give up on his effort for a Europe-wide automotive rescue.

"Unfortunately, my call for a coordinated intervention has fallen on deaf ears," he said. "Certainly, from my German colleagues who do not see need for Europe to intervene. So we're now left to our own."

--Jeff Bennett contributed to this article.

Write to Joseph B. White at joseph.white@wsj.com and Christina Rogers at christina.rogers@wsj.com

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