Someone earlier asked the question and I still haven't seen an answer ...

Let's say you drain a little off at every fill up. What do you do with what you've drained off?

 

Either let it flow on to the ground at the pump or at the back of the truck stop. My self I thought that is what the back of the truck stop lot was for, to either repair your truck or drain off water from the filter Have you not ever noticed how many truckers and other people work on things at the back of the lot and leave oil and grease and what not all over the place?

 

I'm pretty sure there was a thread about using trans fluid a few weeks back and it was said that it can seriously hurt the electrical injector pumps in the newer trucks.