The fluid is becoming less expensive. It was around $10/gal, which is $100 for a 10 gallon tank.
It’s more the concept of a bill for replacing fluid that would never occur to someone who hadn’t owned a diesel before. I never knew about it till I read about an ambulance that refused to go because the engine shut down with no fluid.
That and it sounds preposterous, like turn signal fluid.
I’m reading you can find it at truck stops in the $2-3/gal range.