'Engines failing': DKS accuses Centre of 'cover up' amid ethanol blending row

Karnataka’s dispute concerns whether petrol sold at some outlets contained more ethanol than permitted. The state government says excessive blending may have caused repeated engine stoppages and lower mileage. The issue matters because the prescribed limit is linked to fuel standards and vehicle compatibility.

Karnataka collected samples from 67 locations and said testing at seven places recorded ethanol levels as high as 31.2%. The government alleges that mixing occurred at petrol bunks during distribution, not during the original supply process. It says cheaper ethanol may have been added to increase profits.

The dispute remains unresolved. Indian Oil, Bharat Petroleum and Hindustan Petroleum reject the allegations and say their petrol complied with Bureau of Indian Standards specifications for E20 fuel. They have questioned the state’s sampling and testing methods. Karnataka says more findings will be made public after its investigation.

Ethanol blending is the practice of adding ethanol to petrol before it reaches vehicles. Ethanol is a fuel that can be produced from plant-based materials. The blend is described by the percentage of ethanol in the mixture. This matters because engines and fuel systems must be suitable for the blend being used.

E20 means petrol containing 20% ethanol. In simple terms, every 100 units of E20 fuel contain 20 units of ethanol and 80 units of petrol. The article identifies E20 as the Bureau of Indian Standards specification cited by the oil companies. Karnataka’s dispute centres on whether some samples exceeded that level.

The article does not explain the full technical effects of blending. It does show why the label matters: Karnataka alleges readings up to 31.2%, while the oil companies say their supplied fuel met E20 requirements. The disagreement therefore involves both the measured percentage and the testing process.

The prescribed benchmark in the dispute was 20% ethanol, the level associated with E20 petrol. This limit matters because it defines the fuel specification that the oil companies say they followed. Karnataka is investigating whether petrol at some outlets contained substantially more ethanol than allowed.

The state’s minister said samples from seven locations recorded ethanol levels as high as 31.2%. That result is 11.2 percentage points above the reported 20% limit. The chief minister separately said samples had been collected from 67 locations, with about 30% of the investigation completed.

These figures are allegations from the state investigation, not an accepted final finding. Indian Oil, Bharat Petroleum and Hindustan Petroleum rejected the claims. They said their petrol complied with E20 standards and challenged the sampling procedure, laboratory certificates and testing methodology used in the state’s October 2026 exercise.

When petrol contains more ethanol than a vehicle is designed to handle, the engine and fuel system may not operate properly. Possible effects include difficult running, repeated stoppages, damage to fuel-system materials and reduced mileage. The exact result depends on the vehicle’s design and the fuel actually used.

The Karnataka chief minister said thousands of vehicles were experiencing problems. He specifically mentioned engines stopping repeatedly and mileage decreasing. These reported complaints are the practical reason the dispute matters beyond a measurement at a laboratory. They suggest that fuel quality may affect drivers’ reliability and running costs.

The article does not establish that excess ethanol caused every reported vehicle problem. The state is still investigating, and its minister said testing covered samples from seven locations, while the chief minister referred to 67 locations overall. Oil companies deny the allegations and dispute the state’s testing procedures, so the technical cause remains contested.

Karnataka chief minister DK Shivakumar, supported by state officials, alleges that some petrol contained excessive ethanol. Food, civil supplies, consumer affairs and legal metrology minister Rizwan Arshad cited test results from seven locations. The state says the issue is dangerous and may be linked to vehicle complaints.

Shivakumar said the alleged mixing occurred at petrol bunks, where fuel was distributed, rather than during the supply process. He also alleged that cheaper ethanol was added to increase profits. The state says it has documents and has informed the Centre about the locations under investigation.

Indian Oil Corporation, Bharat Petroleum Corporation and Hindustan Petroleum reject the allegations in a joint statement. They say petrol supplied across India, including Karnataka, complied with E20 specifications. The companies did not accept the state’s findings as reliable and questioned the sampling and testing methods used.

The dispute is partly about evidence, not only ethanol levels. Karnataka relies on samples collected during its investigation and says some results showed readings above the 20% limit. The government says it has documents and plans to release more findings publicly after completing more of its work.

The oil companies challenge how the evidence was produced. Indian Oil, Bharat Petroleum and Hindustan Petroleum say the state’s October 2026 exercise relied on third-party laboratory certificates. They argue that the certificates did not follow the statutory and technical procedures required for this type of testing.

That difference matters because sampling and laboratory methods can affect the credibility of a fuel measurement. Karnataka says its investigation is about 30% complete and has collected samples from 67 locations. The companies maintain that their supplied petrol complied with Bureau of Indian Standards E20 specifications. Further official findings may clarify the disagreement.

Governments generally blend ethanol with petrol to stretch available fuel supplies, reduce dependence on imported crude oil and support lower greenhouse-gas emissions than petrol alone. These are established energy-policy reasons, but the article does not describe India’s broader policy goals in detail. It focuses on whether the blend stayed within the stated specification.

Ethanol replaces part of the petrol volume, so a larger share of transport fuel can come from domestically produced alcohol rather than imported oil. Its emissions effects depend on how ethanol is produced and transported. The article gives no figures for fuel savings, emissions reductions or import dependence, so those impacts cannot be quantified here.

The immediate Karnataka dispute concerns quality and vehicle suitability. Oil companies say their petrol complied with E20 requirements. Karnataka alleges that some outlets had much higher levels, including 31.2%, and that cheaper ethanol was mixed to increase profits. The investigation and testing dispute will determine what happened at those outlets.