DO NOT RUN AN AIRCRAFT DIESEL ON AUTOMOTIVE DIESEL UNLESS THE MANUFACTURER ALLOWS IT!
There are all kinds of grades of diesel and if you get "summer" diesel fuel with a higher cloud point, you can get into real trouble on a cold day. Diesel fuel contains waxes. These waxes can solidify into little particles that will quickly block your fuel injectors - if the fuel is cold enough and the injector final filter fine enough.
Jet A1 has had the waxes mostly removed which is one of the reasons it has poor lubrication properties compared to diesel, so don't run jet A1 in your diesel car either or the injection pump is going to get scored real fast.
We sometimes "manufactured" diesel fuel when the refinery couldn't provide it by blending jet A1 with lube oil base to get the required lubricity.
As for certified GA being "backward" there are a few points I\'d like to remind you about.
- Aircraft engines spend their entire time operating at 55-100 percent of their rated power. Car engines spend about 10 percent or less at anything like this percentage. The "reliability" you see in car engines is illusory. To get reliability you need to drop power ratings to less than 50 BHP per litre instead of the 100 bhp per litre many car engines turn out.
- The benefits of variable valve timing, overhead camshafts, electronic ignition, electronic fuel injection are not going to produce all that much benefit on a motor that turns 2300 - 2700 rpm day in and day out. True, better fuel injection would be nice so that the engine can be run lean of peak and knock sensors to prevent detonation would be nice as well. Be prepared to have two alternators and three batteries if you want this.
- Then let the whole thing stand for months at a time in the rain and expect it to work first time.