The Ministry of Petroleum and Natural Gas has launched a massive quality-control campaign across India’s retail fuel network and, as of August 25, 2026, stopped petrol sales at 2,573 non-compliant outlets, according to highly placed ministry sources. Indian Oil Corporation (IOCL) leads with 1,257 halted pumps, followed by Hindustan Petroleum (HPCL) at 915 and Bharat Petroleum (BPCL) at 401.

The trigger was a letter from the Society of Indian Automobile Manufacturers (SIAM) to the ministry on July 28, leaked soon after, flagging alarmingly high levels of chloride contamination in E20 fuel samples tested across the country. SIAM withdrew the letter within days, saying the figures “needed further verification”, but the damage was done. A subsequent Reuters investigation into carmakers’ internal testing data kept the contamination question firmly in the public eye and has forced the government to react.

To restore consumer confidence and tackle contaminants and water in the supply chain, the government has mandated water-ingress testing of underground tanks 8 to 12 times a day, a rigorous regime already underway at 88,995 dealerships. A sweeping audit prioritising older retail outlets has covered 84,687 fuel stations; field teams are checking tank integrity during rainfall, and automation systems with monitoring probes are active at 85,649 outlets, with malfunctioning units being repaired on priority.

Oil-marketing companies (OMCs) have conducted 7,296 sulphur tests and 1,079 chloride tests on ethanol-carrying tankers, along with 151 chloride tests on their own storage tanks. 

The intensity of the crackdown reflects a government under pressure to protect the integrity of its green-energy transition. The rollout of E20 (petrol blended with 20 percent ethanol) was accelerated ahead of its original schedule. Since April 1, E20 has been the only petrol available at Indian pumps, leaving motorists with no option of buying the earlier E10 blend.

Automakers’ extensive fuel-testing drive

The move to ensure that the prescribed standards are met at the forecourts is a direct response to growing opposition from motorists and anxiety among the country’s leading vehicle manufacturers.

For motorists, the transition to E20 has brought tangible financial losses arising from lower fuel efficiency and potential mechanical risks. In a widely publicised dispute, a consumer court in Raipur recently directed Maruti Suzuki to replace a Grand Vitara over an E20-related engine complaint, underlining the legal and warranty vulnerabilities facing carmakers. Concerns over mileage loss, accelerated component wear and the compatibility of pre-2023 vehicles have simmered for months.

Behind closed doors, the anxiety ran deeper. While brands like Toyota, Maruti Suzuki and Hero MotoCorp publicly backed the government’s green mandate, a Reuters review of leaked internal communications revealed that Maruti Suzuki, Tata Motors and Mahindra & Mahindra had privately flagged severe contamination in E20 petrol. Over the course of a year, the three carmakers quietly conducted the most extensive fuel-testing drive since the national rollout, collecting and analysing over 250 samples from petrol pumps across 21 states and Union territories.

Leaked report rings alarm bells 

The industry findings, compiled by SIAM and reviewed by Reuters, painted a starkly different picture from official compliance narratives. Against the government’s permissible chloride limit of 3 parts per million (ppm) or 3mg/kg, automaker testing found alarming levels across 18 states: Rajasthan recorded 6 to 570ppm — 190 times the limit; Delhi-NCR ranged from 1.4 to 420ppm and Madhya Pradesh from 4.1 to 550ppm. Karnataka and Kerala, by contrast, stayed well within the safe zone at 1 to 2.2ppm.

Water content spiked to 13,000ppm in Andhra Pradesh and 12,500ppm in Uttar Pradesh, which is more than four times the official permissible limit of 3,000ppm.

In modern engines, these deviations can be damaging. Organic chloride is highly corrosive, and modern precision fuel injectors are engineered to tolerate just 1-3ppm to align with international standards. In a leaked July email, a senior Mahindra executive warned that organic chloride was the root cause of rapid vehicle failures, capable of destroying fuel systems and engines in as little as 200km. Mahindra has since described interpretations drawn from the email as baseless, calling the industry data limited and preliminary. 

Skoda Auto India brand director Ashish Gupta, in a recent interaction with Autocar Professional, acknowledged a genuine issue with EPC (Electronic Power Control) and fuel pump failures in certain parts of the country, particularly in Punjab. He added that while fuel-sample testing has not shown a definitive chemical difference, engineers suspect high chloride or high sulphur levels, which can clog the fuel-pump filters.

The regulatory gap

To be fair, BIS standards currently lack a formally mandated statutory threshold for inorganic chlorides in finished ethanol-blended petrol (like E20). However, the petroleum ministry and OMCs enforce internal procurement guidelines, capping the limit at 3ppm for ethanol manufacturers. Setting BIS standards that make chloride limits mandatory is urgently needed, as the main culprit for vehicle damage is not E20 petrol but the chloride levels in it.

With inputs from Shahkar Abidi