My rusty Cummins says "hello" to yours. Every time I think of not buying a new truck attached to DEF fluid, I can't help but wonder how many plants are dying for need of that fertilizer (they really do avoid calling DEF "urea"), especially the corn being grown to feed ethanol to cars.

Just a stream of mechanic-farmer consciousness to add to the fray.

"Money money money money! We can't keep doing this, Bob!" -The Incredibles