@daugen said:
"I don't understand why they can't put the DEF in the diesel fuel and stop all this nonsense. I know the chemistry doesn't work that way, being a sort
of afterburner process but makes you wonder if they can't improve on ol' #2 fuel oil. Now it's ultralow most bad stuff but wonder if you dumped a gallon of DEF
in your diesel tank, how that would run. Don't try this at home...."
A little bit of DEF in a 100 gallon fuel tank with a Volvo TAD571 engine comes to a mere $15k to replace the engine fuel system. If you catch it in time. BTDT
Add a little water to the mix and it grows to $35k. BTDT
I can tell more stories...see a lot of stuff with DEF in the wrong places. My favorite was I was at a steel mill and someone had dumped DEF in the hydraulic reservoir of a Cat wheel loader. I forget the model at the moment, but it was really big

The estimate was $100k to clean up the mess in the hydraulic system.
My wife has pretty much been in the rental business since she got out of high school. The stories she can tell. I keep telling her to write a book....but most people would figure it was fiction.
One of my favorites was one cold Sunday morning in January, she gets a panic call from a salesman about a skid steer that, as the customer reported, "wouldn't start". She asked for more detail before she sent a mechanic out to make sure he took the right parts with him. The salesman didn't know if it was batteries, starter, fuel, etc. She told him to call back and find out.
He called her back and said the problem with the skid steer was it was under water! The customer had left it running and moved it onto a frozen storage pond to get it out of the road. The heat from the engine softened the ice and skid steer went for a swim. She told him forget it, she would deal with it on Monday. I still get a laugh out of that one.