Commodities● Neutral
SIAM's E20 U-Turn: Chloride Contamination and the Politics of Ethanol
SIAM warned of chloride contamination in E20 fuel causing component failures, then withdrew the letter days later. The U-turn reveals how ethanol blending now touches farm incomes, energy security, and vehicle durability — with Punjab opposing the rollout while ethanol-producing states stay silent.
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The Society of Indian Automobile Manufacturers wrote to Petroleum Secretary Neeraj Mittal on July 28 with what looked like an urgent request. SIAM said its members were seeing a "huge increase" in failures of fuel injectors, fuel pumps, exhaust gas recirculation valves, and other components in direct contact with fuel or engine emissions. Investigations into failed parts pointed to corrosion and wear caused by high chloride contamination in E20 fuel – 20% ethanol mixed with petrol.
Fuel samples from vehicles showed chloride levels of up to 500 parts per million. Samples from retail outlets showed contamination of up to 350 ppm, according to the letter. It also flagged unusually high moisture levels in some samples, warning that excess water could cause phase separation – a condition where ethanol and petrol separate – leaving vehicles unable to run immediately after refuelling.
SIAM urged the ministry of petroleum and natural gas to introduce mandatory chloride limits in fuel specifications through the Bureau of Indian Standards, direct oil marketing companies to identify the contamination source, and strengthen fuel quality controls.
Less than a week later, the public posture flipped. On August 4 night – after the letter entered the public domain and MoPNG issued a clarification defending the E20 programme – SIAM said the figures in its communication required "authentication through collection of elaborate data from various regions across the country followed by a comprehensive consultation with our member OEMs." The correspondence was part of "routine and ongoing technical deliberations" between industry, oil companies, and government agencies. It reassured consumers there was "no cause for concern" and formally withdrew the earlier communication.
In one document, SIAM cited specific contamination levels, linked them to field failures, and sought immediate regulatory intervention. In the other, it said those figures needed further validation before any conclusions could be drawn.
Why the industry's public position changed is difficult to say. The developments demonstrated that ethanol-blended petrol has become one of the country's most politically and commercially sensitive policy issues.
For the Union government, ethanol blending is a pillar of India's energy security strategy – reducing crude oil imports, saving foreign exchange, and creating an additional market for agricultural produce. For automobile manufacturers, the priority is ensuring vehicle durability after years spent redesigning engines and components for E20 compatibility. For vehicle owners, the concerns are more immediate. Several consumers have taken to social media and other public forums complaining of lower mileage after shifting to E20 petrol. Some have reported maintenance-related issues.
Road transport and highways minister Nitin Gadkari told Parliament recently that fuel efficiency could decline by 2-6% depending on the age and type of vehicle. He stated that testing had failed to link engine failures with E20 use.