Audi has won rounds two and four of its 12-round fight with BMW brand, but the world luxury-car champ is still ahead on the overall scorecard.
Audi outsold BMW brand by 4,474 units in January and by 2,902 vehicles in April, according to the data from the companies.
BMW brand beat Audi by 4,908 units in February and 11,495 vehicle sales in March.
After four months, BMW brand leads Audi 512,000 to 503,000.
In the United States, BMW division sales rose 7 percent to 88,127 vehicles during the first four months. Audi sales rose 16 percent 47,343.
The race should remain tight for the rest of the year. Audi just started local production of the Q3 SUV in China, where there is a strong demand for compact crossovers.
BMW expects a boost from the arrival of the 3-series Gran Turismo as well as continued strong global sales for the sedan and wagon versions of the 3 series.
If you're wondering where Mercedes-Benz brand stands after four months, the automaker has sold 441,464 vehicles, leaving it a distant third. But in the United States, Mercedes sales are up 11 percent to 98,511 vehicles -- including 5,689 Sprinter vans. The U.S. market, as a whole, is up 7 percent through April.
Philip Nussel contributed to this report.