A study by the Automotive Research Association of India (ARAI) revealed that using E20 fuel in E10-compliant vehicles may cause deterioration in rubber components like hoses, gaskets, and seals.While metallic parts showed no adverse effects, some engines faced issues during durability tests.For instance, a BS-IV engine performed well with E20, but a BS-VI turbocharged engine showed thermomechanical failure after 265 hours.Two-wheelers tested with E20 showed no issues, but fuel consumption increased by 2-6% compared to E10.

The report, not yet public, serves as a reference for policymakers and manufacturers, emphasizing the need for component replacement and further testing for long-term engine durability.