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ARAI study flags E20 damage to rubber in E10 vehicles
Autocar India··7 Jul
A resurfaced 2021 ARAI study highlighted on July 7, 2026, found E20 fuel could deteriorate some rubber and plastic fuel-system components in vehicles not designed for higher ethanol blends. Metals showed insignificant corrosion impact but NBR-PVC and epichlorohydrin elastomers showed greater deterioration than commercial gasoline. All new vehicles sold from April 2023 are E20-material compliant.
Prism
What It Means For You
- Older E10 vehicles may face rubber seal and hose deterioration.
- Motorists could see up to 6 percent mileage drops on some cars.
- Ethanol conversion kits exist but manufacturers have not offered them.
What's Happening
- 2021 ARAI study resurfaced amid E20 backlash on July 7.
- Rubber components in fuel systems showed deterioration under E20.
- Government is likely to delay moving beyond E20 to E25.
Policy Context
- E20 became standard nationwide ahead of the 2030 target.
- Vehicles manufactured from April 2023 are E20 compliant.
- BIS recently notified standards for E22, E25, E27 and E30 blends.
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