General Motors' Chevrolet brand and Ford Motor were among the biggest losers as the collapse in car sales in the Russia failed to find a bottom in May.
Volume plunged 58 percent last month to 280,900, compared with May 2008.
Sales of Lada cars, Russia's best-selling brand, fell by 54 percent to 28,163. No. 2 seller Chevrolet was down 52 percent to 10,263 while Ford, the country's third best-selling brand, saw sales decline by 69 percent to 5,798.
The Russian car market was expected to become the largest in Europe this year, but instead has gone from bad to worse, data from the Moscow-based Association of European Businesses (AEB) showed.
Year-on-year sales fell 47 percent in March, and 53 percent in April, making May the worst month yet.
"So far government support measures have not been able to stop the decrease in sales or change the continuing trend," Martin Jahn, vice chairmen of the AEB Automobile Manufacturers Committee, said in a statement.
Jahn urged the government to move quickly in expanding its program to lower the price of car loans.
"The volume of funds for the program should be increased extending the program to all locally manufactured cars, lifting the threshold of the program from 350,000 to 600,000 rubles as soon as possible," he said.
In its current form, the scheme offers subsidies to banks for charging lower rates on car loans. It applies to 30 foreign and domestic models costing 350,000 rubles ($11,400) or less.
Russia's industry and trade ministry admitted last month that it has failed to attract buyers in significant numbers, and proposed expanding the program to include cars costing up to 600,000 rubles.
Industry and Trade Minister Viktor Khristenko has forecast a decline in sales of more than 60 percent in 2009, implying that the worst is still to come for this market.
Russia's car sales were down 47 percent to 645,162 in the first five months of this year.