When the government announced that E20 would become India’s only petrol from April 1, 2026, every vehicle manufacturer in the country had to respond. Some had been preparing for years. Others were caught between a compliance deadline and a customer base driving vehicles never designed for high-ethanol fuel. This article maps how India’s major OEMs — car, two-wheeler, and commercial — have responded to the E20 mandate, what they have certified, and what they have quietly left unsaid.

The compliance timeline

The Ministry of Road Transport & Highways (MoRTH) issued a notification in March 2023 requiring all new vehicles manufactured from April 1, 2023 to be E20-compatible. This gave OEMs roughly one year of lead time from notification to enforcement.

The mandate itself — that only E20 petrol would be sold at pumps — came later, with the February 17, 2026 notification from the Ministry of Petroleum & Natural Gas (MoPNG) setting April 1, 2026 as the date. By then, vehicles manufactured for over two years were supposed to be E20-ready. But the hundreds of millions of vehicles made before April 2023 were not.

What major car manufacturers did

Maruti Suzuki

India’s largest carmaker by volume, Maruti Suzuki began E20-compatible production across its lineup from early 2023. Most new models (Swift, Baleno, Brezza, Ertiga, etc.) carry an E20 sticker on the fuel cap. However, the company has not issued any specific retrofit guidance for its vast installed base of older vehicles — including millions of Altos, WagonRs, and Swifts from the 2010s that remain on the road.

Hyundai & Kia

Hyundai Motor India and Kia India transitioned new production to E20-compatible fuel systems starting mid-2023. Both brands have publicly stated that using E20 in their post-April 2023 vehicles will not void the warranty, provided owners follow the recommended service schedule. For older models, the standard line is “E10-compatible as per earlier norms.”

Tata Motors

Tata Motors moved its petrol lineup (Nexon, Punch, Tiago, etc.) to E20 compliance ahead of the deadline. Tata has also positioned itself heavily in the EV segment, which sidesteps the ethanol question entirely. For its older petrol vehicles, no specific retrofit or compensation programme exists.

Mahindra & Mahindra

Mahindra’s current SUV range (XUV700, Scorpio-N, Thar, XUV400 EV) includes E20-compliant petrol variants. Mahindra’s stronger presence in diesel means fewer of its customers are directly affected by the E20 petrol mandate, but those with older petrol Boleros and KUV100s face the same risk as other pre-2023 vehicle owners.

Toyota & Honda

Toyota Kirloskar and Honda Cars India have confirmed E20 readiness for their current production models. Honda, which exited several segments in India, has a smaller footprint, but older City and Amaze models remain widely in use. Toyota’s strong hybrid push (Urban Cruiser Hyryder, Innova Hycross) reduces but does not eliminate E20 exposure for its customers.

Two-wheeler manufacturers

Hero MotoCorp

India’s largest two-wheeler manufacturer began transitioning its lineup — Splendor, HF Deluxe, Glamour, Xtreme — to E20-compatible fuel systems from 2023. Hero’s challenge is the sheer volume of older bikes on the road: the Splendor family alone has an installed base of tens of millions. No recall or retrofit programme has been announced.

Honda Motorcycle & Scooter India (HMSI)

HMSI transitioned the Activa, Shine, SP125, and Unicorn to E20 compatibility. The Activa, India’s best-selling scooter, has been E20-ready in production since mid-2023. Older Activa models (up to the 6G produced before 2023) were designed for E5/E10 and remain on the road in enormous numbers.

Bajaj Auto & TVS Motor

Bajaj (Pulsar, CT, Platina) and TVS (Jupiter, Apache, Raider) both confirmed E20-compatible production from 2023. Bajaj has additionally developed flex-fuel prototypes compatible with higher ethanol blends, positioning itself for the government’s post-E20 roadmap. TVS has done the same with E85-compatible prototypes of the Apache.

Royal Enfield

Royal Enfield’s current models (Classic 350, Hunter 350, Meteor) are E20-certified. However, older Royal Enfield Bullets — especially the cast-iron engine variants — are among the vehicles most frequently cited by owners reporting E20-related problems. These older engines have carburettors, older rubber compounds, and fuel-system designs that predate any consideration of high-ethanol fuel.

The SIAM position

The Society of Indian Automobile Manufacturers (SIAM), the auto industry’s lobby group, has publicly supported the E20 mandate and stated that all new vehicles sold since April 2023 are compliant. SIAM’s stance is that using E20 in compliant vehicles will not cause harm or void warranties.

What SIAM has not done is address the pre-2023 fleet. The industry body has not called for retrofit programmes, extended warranties for older vehicles, or consumer compensation mechanisms. It has not challenged the government’s timeline or advocated for fuel-choice at pumps. Whether this is pragmatic compliance or quiet abdication of responsibility for existing customers is a question each owner can answer for themselves.

What OEMs have not said

Across the board, there are things no major OEM has publicly addressed:

  • No recall or retrofit for older vehicles. Not a single manufacturer has announced a programme to help pre-2023 vehicle owners adapt their fuel systems to E20.
  • No specific mileage data. OEMs have not published their own E0-vs-E20 mileage comparisons for older models still in widespread use.
  • No position on fuel choice. No OEM has publicly supported the demand for E0/E5/E10 to remain available alongside E20.
  • No acknowledgment of damage reports. While thousands of owners report fuel-system issues, no manufacturer has issued a service bulletin specifically addressing E20-related wear on pre-2023 models.

Flex-fuel vehicles: the next chapter

Several OEMs have developed or announced flex-fuel vehicle (FFV) prototypes capable of running on E85 or even E100. Toyota showcased a flex-fuel Innova HyCross in 2023; Bajaj and TVS have demonstrated E85-compatible two-wheelers. However, no mass-market FFV is currently on sale in India. The government has proposed FFV standards under the Central Motor Vehicles Rules, but no mandatory timeline for FFV production has been set.

Flex-fuel technology addresses the future of ethanol blending. It does nothing for the hundreds of millions of vehicles on the road today that are already grappling with E20.

OEMs have complied with the letter of the E20 mandate for new production. They have not addressed the installed base. Hundreds of millions of vehicles were built for lower-ethanol fuel, and their owners have been left to deal with E20 on their own. The industry’s silence on fuel choice, retrofit support, and damage accountability is a gap that the citizen movement is filling.