E20 petrol is a fuel blend of about 20% ethanol and 80% petrol. It is part of India's ethanol blending programme and is widely available at many fuel stations as of 2026.

Does E20 petrol damage car engines?

Official and industry assessments discussed in Parliament (citing IOCL, IIP Dehradun, SIAM, and ARAI) indicated no need to modify most car and two-wheeler engines for E20, with no major abnormal wear and acceptable drivability. That is not the same as saying zero maintenance—older rubber parts may still need attention.

Will E20 reduce mileage?

Because ethanol has a slightly lower calorific value than petrol, a mileage drop is possible. According to Minister Nitin Gadkari in Parliament, fuel efficiency of vehicles may be reduced by about 2% to 6% depending on vehicle category and vintage. On-road results can still vary with driving conditions.

Do BS-III cars need changes for E20?

BS-III norms were introduced from 1 April 2005, and many such vehicles were manufactured before 2016. The July 2026 Parliament note indicated some BS-III vehicles may need rubber parts or gaskets replaced during routine service—not that every engine must be rebuilt.

What did Nitin Gadkari say about E20 in Parliament (July 2026)?

The note associated with his reply stated that fuel efficiency may be reduced by about 2% to 6% depending on vehicle category and vintage, and that dynamometer engine durability tests and on-road vehicle tests have not shown failures due to E20. It also referenced studies showing most vehicles do not need engine modification for E20, no major abnormal wear, okay metal/plastic compatibility, and that BS-VI vehicles meet norms on E20, while some older BS-III vehicles may need rubber/gasket replacement in service.

What is the Maruti Wagon R Bioflex?

It is a flex-fuel Wagon R positioned around Rs 7.24 lakh, designed to run across higher ethanol blends (such as E20–E85/higher), typically with upgraded fuel injectors, pump, lines, ECU calibration, and an ethanol sensor.

What should older-car owners do practically?

Keep regular service intervals, inspect fuel lines, hoses, and seals, replace degraded rubber parts with suitable components, and follow OEM or authorised-service guidance rather than unverified social-media claims.