Overall auto sales, including commercial vehicles and buses, fell nearly 15% on the year to 50,272 units in the first half, the data showed.
In June compared with May, however, new car sales were up 7% to 10,341 units. Overall auto sales increased 3% on the month to 11,732 units.
Romanian car sales fell 18.3% on the year to 119,417 units in 2010.