While putting in some diesel additive last night a "gentleman" interrupted me trying to sell me a coat so he could put gas in his SUV.

I mistakenly put the fuel supplement into the DEF tank.

It was 8 oz and I am not sure what to do, if anything.

I read earlier where some have flushed their tanks after a delete.

So maybe I should empty the contents then add clean DEF.

Unless some one else has done this (I doubt it) and everything was fine.

Thanks in advance for the advice.

Oh I did drive it about 100 miles the gauge on the DEF is 3/4 full.

Not dash lights came on....yet.