🇮🇳 India is planning 15% isobutanol blending in diesel after the E20 petrol. 🤯

And this isobutanol diesel push has the same pattern that should worry you as the E20 rollout did.
The government's own road transport secretary called a mandate "quite likely by the end of 2026." That timeline is being set before automakers have completed durability testing on how a 15% blend interacts with modern fuel injection systems and diesel particulate filters over real mileage. This is not a small technical detail, ethanol blending in diesel already failed once in 2025 because of phase separation, and isobutanol is now being pushed as the fix on the back of pilot generator sets and BPCL research the public has never seen in full.
Every major announcement so far has come at a flex-fuel vehicle launch event, not a technical briefing. That is a pattern, announce the policy win at a press moment, let the engineering catch up after.
And this is happening while the Ministry of Petroleum is still actively fighting public backlash over E20, having to publicly deny that ethanol blending damages engines, voids warranties, and strains water resources. The government has not resolved the trust deficit from the last mandate, and it is already building momentum for the next one that touches nearly double the fuel volume.
Reducing crude imports is a legitimate goal. Mandating a blend for 40% of India's fuel supply before durability data and warranty clarity exist is not caution, it is politics moving faster than the chemistry.