Droptine185, Welcome to HealingWell.
I don't know the answer to your question. Hopefully someone else will reply. However, I believe it's been proven that the incidence of Parkinson's in people exposed to jet fuel on aircraft carriers is higher. (I realize those are not exactly the same - diesel and jet fuel.) I just 'googled' "diesel fuel and Parkinson's" and found some interesting comments. Also interesting comments re: jet fuel if you 'google' "jet fuel and Parkinson's".
Hope this helps ... and best of luck.
Parkinson's Disease Moderator
Diagnosed with Parkinson's disease 2001. Meds: 6 mg Pramipexole (generic for Mirapex) , Amantadine 200 mg
Life is a dance. Don't sit it out. ---- Jackson H. Brown