When my ad blue tank starts to get low I get an annoying mono-tone female voice tell me every time I start the engine if tank running low.
She goes…
”Warning adblue tank at 25% replenish when possible” (% changes everytime you start engine again if it got even lower)
And when it has run dry the annoying mono tone lady says….
”Attention Adblue has been depleted engine efficiency has been compromised, replenish when possible”
Adblue is not corrosive its 83% water, just wash your hands afterwards 
When my ad blue tank starts to get low I get an annoying mono-tone female voice tell me every time I start the engine if tank running low.
She goes…
”Warning adblue tank at 28% replenish when possible” (% goes down every time start engine if more empty)
And when it has run dry the annoying mono tone lady says….
”Attention Adblue has been depleted engine efficiency has been compromised, replenish when possible”
Adblue is not corrosive its 83% water, just wash your hands afterwards
johnpirate:
Our Mercs suffer damage if water is put in.There are big warning stickers everywhere.We were carrying a 10 litre drum of Adblue with us in case we ran out.But it turns out Adblue only has a 6 month shelf life then it returns to a solid state.We have had a few problems with that.Also as you turn off the system is supposed to purge itself as Adblue is highly corrosive.Systems blocked exhausts rotted through doesnt fill you with confidence.I prefer the Scania EGR system that doesnt need Adblue.But the engine does feel a bit strangled.
Just a thought but with the 16v vauxhall engines that had EGR valves on them the heads used to get choked up with carbon deposits wich could be prevented by blocking off the EGR valve. Also the old transit van iv got has the smallest diff in it and uses loads of fuel, a guy i know told me blanking off the EGR valve would get me better mpg, so i did 2years back and although i cant say i noticed much improvment in mpg, but a couple of weeks later when i took the plate out and seen the amount of soot that iv obviously stopped going through the engine i decided to leave it in.
So the point being for a strangled Scania EGR engine, why not just blank off the EGR for a cleaner engine and better mpg.
bullitt:
Just a quick question…but where does the “urea” come from?.I mean, who actually collects it and how■■?
Is it animal or human and are there tankers driving around loaded with it■■?
When I worked at Newcastle Airport, they used urea as a de-icer on the runway, albeit in pellet form, that was derived from sheeps ■■■■.
Is ad blue.Only blue in colour? or can it come as a clear liquid?
As iv’e seen a polish driver waiting at our place,top his ad blue tank up out of a 5 gallon clear drum with what looked like water.
Tonyb
tonyb70:
Is ad blue.Only blue in colour? or can it come as a clear liquid?
As iv’e seen a polish driver waiting at our place,top his ad blue tank up out of a 5 gallon clear drum with what looked like water.Tonyb
it’s clear.
limeyphil:
No it’s not a myth.
Adblue is a useless addition. It just sprays the fumes in the exhaust to cool them down. Water does exactly the same thing.
I’ll add chemistry to the list of things you know nothing about… 
The only reason IT APPEARS TO WORK is that the level sensor tells the ECU there’s Adblue in the tank. Nothing chemically analyses what goes through the system so it doesn’t throw up an error nor enter reduced power mode.
Conor:
limeyphil:
No it’s not a myth.
Adblue is a useless addition. It just sprays the fumes in the exhaust to cool them down. Water does exactly the same thing.I’ll add chemistry to the list of things you know nothing about…
The only reason IT APPEARS TO WORK is that the level sensor tells the ECU there’s Adblue in the tank. Nothing chemically analyses what goes through the system so it doesn’t throw up an error nor enter reduced power mode.
wheres the chemistry in that. 
so, nothing chemically analyses what goes through the system? that would have been correct in the early adblue days, however, there is now a sensor on the underside of the exhaust that samples the fumes. but quite clearly i know nothing.
Just confirm what some folk are saying, latest engines have a Nox sensor fitted which samples the exhaust gas as it leaves the silencer. No adblue (or water) which is useless will log a fault code and derate the engine.
limeyphil:
wheres the chemistry in that.
so, nothing chemically analyses what goes through the system? that would have been correct in the early adblue days, however, there is now a sensor on the underside of the exhaust that samples the fumes. but quite clearly i know nothing.
You’re definitely right there. The sensor does nothing more than measure the emissions for NOx, CO, particulates etc but not specifically for the presence of Adblue. As long as the emissions are at or below set limits, no fault will flash up. My wife’s Mitsubishi FTO passes a CAT emissions test yet has no catalytic converter - likewise an engine can probably meet Euro 5 emissions without a working Adblue system.
Blimey, 2 pages of talking nothing but pi55.
Obviously the water is only the medium used to hold the urea in suspension & carry it. So if putting H2O in the AdB tank, it will stop the low level sensor coming on, prevent the pump running dry, but do absolutely beggar all for emission reduction.
I’d guess its pig pee. Wonder how much a litre they pay?
NB12:
Just a thought but with the 16v vauxhall engines that had EGR valves on them the heads used to get choked up with carbon deposits wich could be prevented by blocking off the EGR valve.
This is caused by the ecotecs thirst for burning oil, the residue from which winds up clogging up the EGR valve, and as I discovered the other day, the throttle body. The problem with just blanking off the EGR valve is that, depending on the engine, it can upset the ECU and will keep giving you an Emissions Control fault, unless you take it to Vauxhall and have the ECU reflashed to upgrade the software on it so it can cope without it. Back on topic, any idea why our brand new Volvo FL7s tend to pump adblue out onto the tarmac when you turn the engine off?