Water in Diesel is a big issue, hence almost all diesel vehicles having water separators in the fuel systems.
Diesel is allowed in some aero engines, read the flight/maintenance manuals, ditto petrol (in limited amounts).
PT-6's are permitted to run on specific grades of Diesel for restricted use....
see page 19 here...
http://www.pwc.ca/files/en/Know_your_PT6A.pdf