E20 fuel may damage rubber parts in E10 cars, said unpublished report

An ARAI report noted rubber part deterioration in E10 vehicles using E20 fuel. Metallic components showed no adverse impact, and emissions remained within legislative limits. One BS-VI turbocharged engine experienced issues after durability testing, unlike a BS-IV engine. Two-wheeler engine durability tests showed acceptable performance with E20 fuel. Fuel consumption increased by two to six percent for vehicles using E20.