E20 Contamination Claims Don't Hold up to Testing, Oil Marketers Say

India's state-run oil marketing companies including Indian Oil, HPCL and BPCL have together mounted a detailed public defense of the country's 20% ethanol-blended petrol, releasing results from an intensive nationwide testing drive that they say disproves media reports of chloride contamination and water in the fuel.

The companies said samples drawn from every stage of the supply chain, which includes refineries, ethanol distilleries, storage depots, tanker trucks and retail pumps, showed chloride levels between zero and 3 parts per million, far below the several-hundred-ppm figures that had circulated in recent reports. Claims of chloride concentrations as high as 500 ppm, they said, could not be validated.

The stakes for the automotive industry are considerable. Chloride is corrosive to fuel-system components, and elevated levels in petrol can attack fuel pumps, injectors and metal fuel lines over time. Water in fuel, meanwhile, is a particular concern with ethanol blends because ethanol absorbs moisture readily; beyond a threshold, the fuel can separate into layers, starving engines of a consistent air-fuel mixture and accelerating corrosion. Vehicle manufacturers calibrated their engines for E20 on the assumption that the fuel would meet government specifications, and any credible evidence of contamination would reopen a debate the industry considered settled.

That debate has simmered since India accelerated its ethanol blending programme, which reached the 20% target ahead of schedule. Automakers had earlier flagged that vehicles built before 2023 were not designed for E20, prompting consumer concerns about mileage loss and component wear. The latest contamination reports threatened to compound that unease, which likely explains the speed and granularity of the oil companies' response.

According to the release, more than 100 randomly selected petrol samples from refineries showed chloride at or below 1 ppm. A joint task force of the oil companies and the Centre for High Technology, the petroleum ministry's technical arm, tested ethanol from 80 distilleries over ten days, all returning readings below 3 ppm. More than 80 samples from terminals and over 160 from retail outlets fell within the same range of 0-3 ppm.

The companies did acknowledge two isolated cases of elevated chloride at retail outlets. Supplies at those locations were suspended, investigated and restored only after corrective measures.

On the moisture question, the companies said roughly 90,000 fuel stations have begun mandatory inspections of underground storage tanks, checked 8 to 12 times daily, with no water intrusion detected so far. Mobile testing laboratories have been deployed, and results are being cross-checked by independent fuel laboratories. Tabulated results are being published on the Centre for High Technology's website and will be updated as more data arrives.

For automakers and component suppliers, the episode underscores a structural feature of the ethanol era: fuel quality is now a shared reputational risk. When consumers experience drivability problems, the blame can land on the vehicle, the fuel or both. For now, the message to India's motorists is : keep filling up with E20.