I have a jerry can I use to ferry diesel to my boat. Is it OK to use it on occasion for gasoline for the car (in the event of my son running out of gas somewhere)?

There would be traces of diesel in the container and likely will be traces of gasoline when I next use it to transport diesel to the boat.

Would I cause problems with either engine?

Geno.

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2003 E500
2002 C230 Kompressor
1986 420SEL