Model diesel motors use/burn a mixtue of (basic mix) equal parts Ether, liquid parafin, castor oil.
Ether- lowers the ignition temperature /and compression needed to acheive same
Liquid parafin- Fuel- can be Kerosine, Auto Diesel, Jet A, Lamp oil. Kerosine burns cleanest.
Castor oil- lubricant- can be 10W50 motor oil, synthetic oils in some motors- recomend Castor in an LA.
Davis make diesel conversion heads and have premixed fuel.
Props- Diesels generally produce more torque so can swing larger props ( at lower revs) to produce the same thrust at lower fuel consumption .
Stewart