The Centre has rejected allegations that petrol sold at certain outlets in Karnataka contains ethanol far beyond the prescribed limit, stating that fuel supplied by public-sector oil marketing companies meets established quality standards. The dispute has intensified after the Karnataka government reported unusually high ethanol concentrations in samples collected from several districts, raising concerns about fuel quality, vehicle performance and consumer protection.
The Union Ministry of Petroleum and Natural Gas said Indian Oil Corporation Limited (IOCL), Bharat Petroleum Corporation Limited (BPCL) and Hindustan Petroleum Corporation Limited (HPCL) had maintained that their E20 petrol complied with the Bureau of Indian Standards’ IS 17021 specifications.
The disagreement centres on two sets of test results: Karnataka’s reported findings of ethanol levels reaching 31.2% in some samples and the oil companies’ claim that their own monitoring showed fuel within the prescribed range. The competing results have prompted calls for transparent, independent testing.
Karnataka Reports Ethanol Levels Above 30%
The controversy emerged after Karnataka’s Department of Food, Civil Supplies, Consumer Affairs and Legal Metrology tested petrol samples collected from retail outlets across seven districts.
According to the state government’s reported findings, some samples contained between 26% and 31.2% ethanol, exceeding the 20% benchmark associated with E20 petrol. Of the 14 samples cited in the controversy, 11 were reportedly found to contain ethanol above that level.
The samples were collected from locations including Bengaluru, Kolar, Chikkaballapura, Bengaluru Rural, Ramanagara, Mangaluru and Tumakuru.
The state’s findings have raised questions about whether motorists were receiving petrol with the composition declared under the E20 standard. Officials have also expressed concerns about the potential consequences for vehicle performance and the responsibilities of companies supplying fuel.
However, the reported results remain disputed, and the allegations have not been conclusively established through a mutually accepted testing process.
Oil Companies Challenge Sampling and Testing Procedures
The three public-sector oil marketing companies have rejected the allegations, arguing that the reported results were not obtained through the prescribed statutory and technical procedures.
In a joint statement, the companies said the sampling exercise conducted in October 2026 raised concerns because their representatives were reportedly not involved in collecting the samples.
They also said they had not received the corresponding retained samples, complete outlet-wise information or detailed laboratory reports needed to independently verify the findings.
Under the prescribed procedure, six one-litre samples are to be collected from a location. Two are handed to the dealer, two are retained by the oil company or the relevant department, and two are sent to a designated laboratory. The procedure is intended to allow the results to be checked and disputed findings to be independently examined.
The companies have asked Karnataka to share the sampling records and laboratory documentation and provide access to counterpart samples for testing at an authorised laboratory in the presence of representatives from both sides.
Centre Cites 893 Compliant E20 Samples
To support their position, the oil companies pointed to a nationwide fuel-quality monitoring exercise conducted across 27 states and Union Territories.
According to their statement, 893 E20 samples were tested, with all falling within the prescribed ethanol-content range of 19% to 21%. The samples included 330 from Indian Oil, 280 from BPCL and 283 from HPCL.
The companies also reported that all 56 samples tested in Karnataka under this monitoring exercise complied with the specifications. Ethanol content in those samples reportedly ranged between 19% and 20%, with an average of 19.30%.
The results, they said, contradicted the substantially higher levels reported by the Karnataka government and reinforced the need for a technically sound, jointly verifiable investigation.
However, the two sets of findings concern different sampling exercises. Their conflicting results make it important to establish whether the samples were collected, handled and tested under comparable conditions before drawing definitive conclusions about fuel quality at the disputed outlets.
What Is E20 Petrol and Why Does It Matter?
E20 petrol is a blend containing up to 20% ethanol, with the remainder consisting primarily of petrol. Ethanol can be produced from agricultural feedstocks such as sugarcane and maize.
India has expanded ethanol blending to reduce dependence on imported crude oil, support domestic agricultural industries and pursue environmental objectives. The programme has become a significant part of the country’s fuel policy.
Nevertheless, ethanol concentration matters because vehicle compatibility varies by model and engine design. Higher-than-specified blending, if established, could raise concerns about fuel performance, mileage and the durability of certain components.
The actual effects would depend on the vehicle, the fuel composition and the extent of any deviation. The disputed laboratory findings alone do not establish that vehicles have suffered damage.
Independent Testing Could Settle the Dispute
The immediate priority is to reconcile Karnataka’s reported results with the oil companies’ monitoring data. Independent testing of properly retained samples under the prescribed procedures could help determine whether the fuel supplied at the affected outlets complied with the applicable standards.
The dispute has also renewed calls for greater transparency in fuel-quality checks and clearer accountability when complaints arise. For motorists, reliable information is essential to maintaining confidence in petrol sold at retail outlets.
Until the conflicting results are independently verified, claims that oil companies supplied petrol containing excessive ethanol should be treated as allegations rather than established violations. The outcome of further testing will be crucial in determining whether regulatory action is warranted.
