It had sold 4,36,328 units in the same month last year.
In the domestic market, sales grew 23 per cent to 5,10,381 units last month as against 4,15,860 units in May 2016, the company said in a statement.
Exports grew 30 per cent to 26,654 units in May as against 20,468 units in the same period of the previous fiscal.