Ministry of Road Transport and Highways vide G.S.R. 625(E) dated 11th August, 2022 has notified regarding retrofitment of CNG and LPG kit on BS (Bharat Stage)-VI gasoline vehicles and replacement of diesel engines with CNG/LPG engines in case of BS-VI vehicles, less than 3.5 tonnes.
As of now, retrofitment of CNG and LPG kits is permissible in motor vehicles complying with BS IV emission norms.