Petrol blended with 20% ethanol (E20) can reduce fuel economy by 2 to 6% depending on the vehicle category and vintage, Road Transport and Highways Minister Nitin Gadkari informed Parliament on Thursday (July 30, 2026). File
| Photo Credit: Shiv Kumar Pushpakar

The story so far: A District Consumer Disputes Redressal Commission in Raipur has directed a Maruti Suzuki dealer to replace a Grand Vitara with a new E20-compatible model and pay compensation after holding that the complainant had been sold a non-E20-compatible vehicle as a new one. The Commission found the dealer and the manufacturer guilty of a deficiency in service and an unfair trade practice.

Maruti Suzuki, however, has disputed the findings, maintaining that the vehicle was fully E20-compatible, that there was evidence of fuel contamination, and that it would challenge the order.

The order has brought into focus the legal remedies available to consumers in disputes involving E20 fuel compatibility, warranty claims and manufacturer liability.

What was the case about?

The case arose from a complaint by a customer who purchased a Maruti Grand Vitara Strong Hybrid Zeta Plus in June 2024. Following repeated stalling issues, the complainant alleged that the vehicle developed problems after being fuelled with E20 petrol. He further claimed that he had not been informed at the time of purchase that the vehicle was not fully compatible with E20 fuel, despite the vehicle having been sold in 2024.

The government mandated public sector oil marketing companies to roll out E20 fuel in a phased manner from April 1, 2023. It also required new petrol vehicles sold from that date to be E20-compatible.

If E20 fuel allegedly damages a vehicle, who could be legally liable?

“In practice, liability may be apportioned along three axes: (a) the vehicle’s manufacture and certification date; (b) whether or not incompatibility was disclosed at the point of sale; and (c) the terms of the warranty,” says S.M. Algaus, Partner, Dispute Resolution, CMS IndusLaw.

According to Mr. Algaus, where a vehicle marketed as E20-compatible suffers from a manufacturing or design defect, or where adequate instructions regarding its use were not provided, consumers may proceed against the manufacturer, dealer and service provider under the product liability provisions of the Consumer Protection Act, 2019.

For older vehicles sold after the E20 compliance requirements came into force without adequate disclosure regarding compatibility, dealers could independently face action under the Consumer Protection Act, depending on the facts of the case.

Mr. Algaus says oil marketing companies(OMC) would ordinarily not be liable merely because they supplied E20 fuel. However, they continue to have statutory obligations to maintain fuel quality, ensure the correct ethanol blend and prevent contamination. If damage results from improperly blended, contaminated or otherwise non-compliant fuel, liability may extend to the oil marketing company or the retailer. He adds that consumers would nevertheless bear the burden of proving that the fuel itself was defective or failed to meet prescribed standards.

The Essential Commodities Act, 1955 and the Motor Spirit and High-Speed Diesel (Regulation of Supply, Distribution and Prevention of Malpractices) Order, 2005 there under, separately impose statutory duties on OMCs to maintain fuel quality.

What legal remedies do consumers have?

Consumers may approach consumer commissions if they believe a vehicle or fuel did not match the representations made by manufacturers or fuel retailers, or if there was a deficiency in service or an unfair trade practice. A complaint may be preferred before the District, State or National Commission, depending on pecuniary jurisdiction under Section 34 of the Consumer Protection Act, 2019.

According to Mr. Algaus, complaints may be founded on four broad grounds depending on the facts: defective goods, deficiency in service such as repeated failed repairs, unfair trade practices including non-disclosure at the point of sale, and statutory product liability.

He notes that consumer disputes are decided on the civil standard of a “preponderance of probabilities”, although allegations of manufacturing defects would ordinarily require technical or expert evidence. Once a complainant establishes that a defective product caused harm, Section 84 of the Consumer Protection Act shifts parts of the burden onto the manufacturer to demonstrate compliance with applicable standards.

Section 87 of the Consumer Protection Act also provides exceptions to product liability. A product liability action cannot ordinarily be maintained where the product has been misused, altered or modified by the consumer.

How do warranty and insurance claims generally work?

There is no specific legal framework requiring manufacturers to honour warranty claims for engine or fuel system damage allegedly caused by E20 fuel in non-compatible vehicles. If a consumer runs a non-compatible vehicle on E20 despite the vehicle not being certified for it, the resulting damage is properly attributable to the owner’s own choice, and liability should not ordinarily stretch to the manufacturer unless the manufacturer had given an express warranty covering such use.

The Centre has clarified that using E20 fuel in accordance with the manufacturer’s specifications will not, by itself, invalidate a motor insurance policy. Claims continue to be assessed based on policy terms, coverage and the circumstances of the loss.

Mr. Algaus says manufacturers may rely on a “misuse” defence where consumers use E20 fuel in vehicles that were expressly not certified for it, particularly where clear warnings were provided in the owner’s manual, warranty booklet or on the fuel cap.

From an insurance perspective, he says the position remains legally unsettled. Much would depend on whether the damage is characterised as an “accidental loss”, which is generally covered, or as mechanical breakdown or gradual wear and tear, which is commonly excluded under motor insurance policies. Since the Insurance Regulatory and Development Authority of India has not issued specific guidance on E20-related claims, courts may ultimately have to interpret existing policy exclusions in the context of ethanol-blended fuel.

Similarly, for older, non-E20-compliant vehicles, however, resulting damage from gradual ethanol corrosion to seals, gaskets, and fuel lines is a progressive degradation, falling squarely within wear and tear rather than sudden accidental damage, and insurers may decline cover on that basis. Whether E20 creates new categories of loss not contemplated by existing policy wordings is a live interpretive question.

What is the PIL before the Supreme Court?

A public interest litigation is pending before the Supreme Court challenging aspects of the nationwide rollout of E20 petrol. The petition seeks greater disclosure on the chemical composition of ethanol-blended petrol, the testing undertaken before its rollout and safeguards for legacy vehicles.

Advocate Narendra Kumar Goswami, appearing as petitioner-in-person, has moved the Court against the Union of India, the Ministry of Road Transport and Highways, the Bureau of Indian Standards, and public sector oil marketing companies IOC, BPCL and HPCL over the implementation of ethanol-blended petrol.

“The petition does not seek to roll back India’s ethanol-blending policy. It expressly accepts that energy security, reduction of crude oil imports, environmental objectives and support to farmers are legitimate policy goals. The contention in the petition is that a welfare policy cannot be implemented by keeping citizens in the dark about what they are buying, whether their vehicles can safely use it, and whether they have any meaningful alternative,” Mr. Goswami said.

What are the constitutional questions surrounding the E20 rollout?

The PIL invokes Articles 14, 19(1)(g), 21 and 300A of the Constitution. These provisions guarantee equality before the law, the freedom to practise any profession, protection of life and personal liberty, and the right against arbitrary deprivation of property.

The petition argues that the gradual disappearance of lower ethanol blends leaves consumers with little practical choice. It contends that this “silent compulsion” to use E20 fuel raises questions relating to livelihood, informed choice and property rights, particularly for owners of legacy vehicles.

Are there regulatory gaps in the E20 transition?

“The legal and regulatory framework in this space is still evolving, and courts are actively engaging with these questions as they arise,” Mr. Algaus says.

He identifies two significant gaps. First, there is no legislative right entitling consumers to access a non-E20 fuel option. Second, there is no comprehensive disclosure regime requiring manufacturers to proactively inform owners of older vehicles about E20 compatibility risks.

“The absence of a consumer choice protection mechanism is a textbook regulatory gap that is already generating litigation,” he says.

Are vehicles adequately tested for E20 compatibility?

Questions have also been raised over the testing undertaken before vehicles were certified as E20-compatible, particularly in relation to legacy vehicles.

Devinder Zalpuri, a senior automobile homologation consultant and former automobile industry executive, says long-term endurance testing is ordinarily carried out by the manufactures before certification to assess vehicle performance.

However Mr. Zalpuri points out, when homologation certification is done which is official approval process that ensures a vehicle, system, or component meets all legal, safety, and environmental standards before it can be sold, only reference fuel is used which is used by all test agency through out the globe which is different to the general petrol available.

According to him, during the press conference held by vehicle manufacturers it was mentioned that The Automotive Research Association of India (ARAI) has conducted tests on the vehicles but refused to divulge the reports in public.

Therefore, no data is currently available in public domain to substantiate the claim on the extent of testing undertaken before manufacturers declared vehicles E20-compatible, particularly for pre-2023 vehicles. Making certification reports public, he says, could improve transparency around the testing process.

As the transition to E20 continues, many of these questions remain under legal review, with courts continuing to address issues relating to consumer rights, liability, warranty, and regulatory safeguards on a case-by-case basis.

Addressing concerns over older vehicles, the Ministry said E20 underwent extensive testing covering engine durability, fuel systems, material compatibility, corrosion resistance, drivability and emissions before its nationwide rollout. File
| Photo Credit: PTI