What does this particular aircrafts (Eurocopter 135) flight manual say re permissible fuels?
Living in Tasmania we had oil house heating and locals ran their diesels on it because that's what it was - diesel. No tax on heating oil, plenty of tax on diesel at the garage.
Some PT-6 are allowed diesel, limitation being OAT to prevent gumming. Crop dusters often use the stuff.
https://www.casa.gov.au/file/78736/d...token=QoRwuv96