The Urea last 13,000 miles and while Urea is made from urine, no, peeing in the tank wont fool it. Forced has an idea though but i wonder if the sensor is a flow sensor. But I see no problem in paying the money to get it refilled when you are spending $60,000+ on a car. If you can afford that then you can afford the Urea.

Oh don't worry. When the system gets fubar'ed because someone filled it with water instead of AdBlue, they'll wish they'd spared those few bucks instead of the few thousand required to properly fix the system.

Mercedes (and the EPA) planned for people like you and use a sensor to monitor the water/urea ratio in the tank. Modern FlexFuel g@ssers can determine the ethanol content in the fuel tank the same way.

Exactly where/how they do it on the BlueTecs, I'm not sure yet. We'll have to wait and see after the public gets hold of them.

wtf, then ill just put a resistor where that sensor goes, or just put a resistor on both the level indicator and the injection system.

Actually
 

(NH2)2-C=O NOT the same as Uric ACID C5H4N4O3 (alternate name urATE).
It's not, not by a long shot. If you are peeing urea (or ammonia), you REALLY need to get to an emergency room before you die. Although, it can be found in decomposing urine, it's quite dangerous in blood or organs.

It's FAR cheaper to manufacture, along with nitrogenous fertilizer.
It was the first synthesized organic molecule, 1828. It is NOT urine, alternate names carbamide and carbonyl diamide. Carbonyl chemicals in any concentrated amounts, tend to be toxic in most vertebrates.

If you ever find a diabetic person who is acting drunk and his/her breath smells like fruity nail polish remover, blowing ketone (carbonyl molecules) call 911 and give them a little sugar (under the tongue) - IF they are not drooling and able to control swallowing.

roflmao! :d