As well as being an Automotive Diesel mechanic, I'm also an LAME on Aircraft from Cessnas to 737's. Firstly, Diesel engines for aviation use will/are run on JetA1, not the traditional diesel oil. The pumping elements/ rotary head depending on the engine is especially hardened to withstand the lesser lubricating qualities of Kerosene. And with the new electronic controls on a lot of the new 'high speed' Japanese/German diesel engines coupled with the advances in weightsaving, the engines are most certainly becoming viable. Bosch, who design the fuel system for the Porshe aero engine also design the diesel injection systems and are no strangers to the demands of design. The Japanese systems (Diesel Kiki and Nippondenso) work with similar systems.