Auto Tata Motors says transition to BS-VI in commercial vehicles won’t be smooth Updated : January 13, 2020 08:04 AM IST Tata Motors reported two consecutive months of higher medium and heavy commercial vehicles (M&HCV) sales in December. There has been an unprecedented level of discounts to push retail offtake in MHCVs, but Butschek says that they are now stabilising as demand shows signs of picking up. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.