E20 Can Damage Rubber Parts

The government's aggressive push to expand the use of E20 fuel (petrol blended with 20% ethanol) might come with some cost for millions of older vehicles. A study by the Automotive Research Association of India (ARAI) found that using E20 in E10-compatible vehicles could lead to deterioration of rubber fuel-system components such as hoses, gaskets, seals and O-rings, with some parts potentially requiring replacement, according to the summary of the report, which was not made public. While one manufacturer found no problems after 400 hours of testing, in the other case, "thermomechanical failure of exhaust valve was observed in the engine(s) tested cumulatively for 809 hours", the newspaper reported. The ARAI study, however, found no adverse impact from E20 on metallic components. The findings assume significance as the Centre continues to promote higher ethanol blending as a key strategy to reduce dependence on imported crude oil, cut emissions and support farmers. However, the transition is taking place even though a large majority of vehicles on Indian roads estimated at over 80% are not compatible with E20 fuel. Most vehicles, particularly those manufactured before 2023, were designed primarily for E10 or lower ethanol blends. People have complained of a drop in mileage and wear and tear due to the use of E20 fuel in E10-compatible vehicles. The government has rubbished the claims.