Domestic passenger car dropped by 0.86 percent to 1,58,996 units in May from 1,60,371 units in same month last year.
Motorcycle sales last month increased 3.34 per cent to 9,85,158 units from 9,53,311 units in 2015, as per data released by the Society of Indian Automobile Manufacturers (SIAM).
Total two-wheeler sales in May increased 9.75 percent to 15,15,556 units.
Sales of commercial vehicles up 16.89 per cent to 57,089 units in May.
Vehicle sales across different categories registered an upsurge of 9.89 per cent to 18,50,764 units from 16,84,263 units in May 2015, it added.