Oil Minister Hardeep Singh Puri refuted allegations that ethanol-blended petrol harms automobile engines. "All...stories you hear about biofuels being harmful for engines...there's a lot of 'BS' - 'B' capital, 'S', capital. and I don't know what that means, but it's a specialiser," he said. Petrol blended with 20% ethanol extracted from sugarcane or foodgrains is safe to use, he said.