New Delhi, July 15 -- A brewing dispute among top automakers threatens to complicate the rollout of India's next wave of emissions standards, landing the industry's lobby group at a crossroads after its largest member reversed its stance on the upcoming regulations.

The Society of Indian Automobile Manufacturers (Siam) had previously agreed on the emissions standards, submitting a consensus proposal to the government in December 2024 regarding the third edition of so-called Corporate Average Fuel Efficiency (CAFE) norms. The rules, set to take effect from April 2027, aimed to slash the average carbon dioxide (CO2) emissions of new passenger vehicles. The proposed target is a fleet-wide average of 91.7 grams of CO2 per kilometer for a typ...