Mumbai, Jan. 18 -- Auto Major Tata Motors on Friday said it has received BS6 Type Approval certificate for its 3.8L NA SGI CNG engine from ARAI (Automotive Research Association of India). It is the first OEM in India to achieve BS6 certification for a naturally aspirated CNG engine for commercial vehicles. This certification includes meeting the tailpipe mass emissions as well as compliance to On-Board Diagnostics (OBD) norms as mandated by government regulation. With this success, Tata Motors continues to stay on its path of offering environment friendly products in India,company statement said. Mr. Rajendra Petkar, Chief Technology Officer (CTO), Tata Motors said, ''This BS6 engine certification milestone has been achieved with intense ...