new delhi, Feb. 12 -- Mahindra and Mahindra Ltd (M&M) and Tata Motors Ltd have secured an early win in emission testing rules for light commercial vehicles, even as they oppose Maruti Suzuki India Ltd's demand for relief for small cars under the separate fuel-efficiency norms. India has exempted N1, or light commercial vehicles (LCV) weighing less than 3.5 tonnes, from compliance under the Worldwide Harmonized Light-Duty Test Procedure (WLTP) for Bharat Stage (BS) VI emission norms. An April 2025 draft had proposed bringing these vehicles under WLTP, but the stricter test was formally notified only for passenger cars and light minibuses on 4 February. The rules will be effective April 2027. The tests limit pollutants per vehicle under more ...