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Diesel oil spill on car - maru
is diesel fuel non-colour and transparent, recently my car was splash by these non-colour oil (which I believe to be diesel), does it harm the paintwork and trimmings etc, on my car. Got it wash away now.

???
Diesel oil spill on car - sierraman
If you have washed it off I would not worry about it,it should not be harmful to paintwork.
Diesel oil spill on car - Andrew-T
Diesel overspill marks on cars are dirty mainly because the residue is sticky. Polish it off, or give a quick wipe with detergent.
Diesel oil spill on car - Sooty Tailpipes
It does seem able to stain white paint yellow, but only after repeated splashes which have been left to dry.