No he is talking about engine cooling issues with the EGR, because you are sticking exhaust gases back into the engine.That is why there is no scania EGR V8 yet because of the trouble of keeping it cool.And on the other hand that is why the VOLVO 660 and the MAN 680 are SCR because this problem doesn’t apply to them.
OLT:
simple cost savings with adblue…dont put it in
Q. What happens if your drive a Euro 4 without AdBlue?
A: The vehicle will continue to operate until the catalyst breaks down
because of the lack of AdBlue or bad material. Some OEM will restrict
vehicle to limp mode @ 20 MPH. In both ceases the vehicle will be classed
as contravening road act and maybe subject to a GV9. 
What about my euro 5 
Ah well, don’t matter much, we fill both diesel and ad-blue at the same time. Even though we don’t use much blue.
adblue is a fluid that goes into your exhaust.
it does not benefit any enviromental aspects. nor does it help your fuel consumption. it is just coloured water.
i believe that the blue part is an anti-freeze to stop it freezing in winter.(the rest is mainly pigs pee)…there have been issues with the exhaust silencers filling up with frozen adblue and causing power problems in northern europe…this also causes problems with turbo failure’s.(scania r-series).
we look after 5 daf xf 105’s(oct 2007)…they use about 1000 litres every 2-3 weeks…they have aluminium adblue tanks from SB components.the same as the above photo.(the mounting brackets are prone to cracking on these-all have been replaced under warranty).
they have run empty once or twice…some reported a power problem,others didn’t notice.
not really convinced yet…just more trouble.
LOOPY LOU:
OLT:
simple cost savings with adblue…dont put it inQ. What happens if your drive a Euro 4 without AdBlue?
A: The vehicle will continue to operate until the catalyst breaks down
because of the lack of AdBlue or bad material. Some OEM will restrict
vehicle to limp mode @ 20 MPH. In both ceases the vehicle will be classed
as contravening road act and maybe subject to a GV9.
it also says at the end
Q. What happens if a heavy duty engine runs without AdBlue?
A: This will result in crossing the allowed emission levels; for the diesel
engine runs in a fuel optimized way, which has a negative impact on the
NOx emission. For that reason sensors are placed in the exhaust pipe to
measure the NOx emission. The measurement results are stored in the
OBD-system (On Board Diagnostic) and are periodically controlled.
Important, when not using the AdBlue liquid the dosing system gets
blocked and will not function when using again and the catalyst itself can
be damaged and clogged as well. Warranty will be withdrawn by the
dealer when driving without AdBlue.
no mention of breaking any laws there,then again they are biased as they are selling it…Also says it will freeze although no freezing point is mentioned but it will freeze,so if it does watch out for the reduced power from the engine.Would be good if your doing 90kph on the M6 and it decided to drop your speed to 20mph
limeyphil:
adblue is a fluid that goes into your exhaust.it does not benefit any enviromental aspects. nor does it help your fuel consumption. it is just coloured water.
this is the most incorrect post so far 
with adblue your engine will comply to euro5 emissions,with out it it will emit all the nasty’s that a euro1 engine used to dish out…adblue is the only way the truck mackers can make there engines comply to the new regulations from brussels…
ellies dad:
limeyphil:
adblue is a fluid that goes into your exhaust.it does not benefit any enviromental aspects. nor does it help your fuel consumption. it is just coloured water.
this is the most incorrect post so far
The only thing i thought he got wrong was when he said it was ‘just coloured water’ ? The rest is true?
wrecktech100:
i believe that the blue part is an anti-freeze to stop it freezing in winter.
You might be onto something there. I have seen tanks which say they should not be switched off (must have heaters in them?) otherwise the adblue will freeze up.
wrecktech100:
(the rest is mainly pigs pee)…
According to every driver i heard it is sheeps pee !! I’d just love to know how they collect it. Its probably easier to make chemical urea which i believe it really is 
Mike-C:
ellies dad:
limeyphil:
adblue is a fluid that goes into your exhaust.it does not benefit any enviromental aspects. nor does it help your fuel consumption. it is just coloured water.
this is the most incorrect post so far
The only thing i thought he got wrong was when he said it was ‘just coloured water’ ? The rest is true?
urea(adblue) is a chemical
if your truck uses it you reduce your emissions and help the enviroment
if your truck uses it the engine can burn fuel more efficently thus helping your fuel economy
the only thing he got right is that its added to your exhaust
ellies dad:
if your truck uses it the engine can burn fuel more efficently thus helping your fuel economy
I’m no scientist (as I don’t have a kipper tie and big sidies along with a lab coat), but that’s a load of cobblers.
To burn anything more efficiently, it has to go into the intake side of the engine which it doesn’t. Therefore how can it improve fuel economy?
All it does is “clean up” the exhaust gases.
macplaxton:
All it does is “clean up” the exhaust gases.
So you’re agreeing with the fact that SCR engines are better for the environment then? I’m an EGR man (or should that be MAN?) myself, but I’ve never heard so much tripe being spewed about Adblue.
truckyboy:
I was looking at a site yesterday, On the subject of Ad Blue, it stated that this is a derivative of sunflower oil or, waste cooking oil, thats been refined
“AdBlue is a derivative of Sunflower oil.” Which website told you that load of rubbish? Probably the same site telling us that McDonalds used to fund the IRA?
Dazza:
macplaxton:
All it does is “clean up” the exhaust gases.So you’re agreeing with the fact that SCR engines are better for the environment then?
To be honest, I’ve no idea. I just couldn’t fathom out how it was meant to give more power (bar not upsetting the engine management if it ran out).
The SCR vehicles run more economical because the engines are detuned to Euro 2 standards so they are tuned for economy/performance not emissions.All the emissions are taken care of in the exhaust with the SCR.
A link to Adbue info and also SCR at the bottom > Here
acd1202:
All Adblue engines go onto emergency reduced power mode if out of AdBlue. This is to keep their emissions at the same level, it is required to qualify for the Euro 5 discount RFL.The Volvo EGR engines have lower power and torque outputs than SGR units.
Somebody said about putting carrying AdBlue in a metal can, this is a REALLY BAD idea. AdBlue is extremely corrosive and will be through in a matter of a few weeks. If you notice all AdBlue tanks on trucks are plastic, and with good reason.
ACD adblue is stored in plastic tanks on trucks because its easier to manufacture a small tank out of plastic than metal, if you look at the larger adblue tanks most are made of alloy or steel.
Also you will find (I know it’s on a lot smaller scale) that a lot of diesel cars have EGR system and how many of you have had problems with them? Also the hot carbon in the fumes acts as a natural lubricant.
Adblue & SCR facts are in a Pdf. download Here
This Ad-Blue stuff seem’s to be corrosive to metal so that could be why most tanks are made from plastic.
I was told that it freezes below -11 degs so the tanks have small heater eliments in them.
Euro 5 motors that got the government rebate seem to be affected if there is a problem with the system, my euro 5 lost 10 mph running empty when the Ad-Blue fault light came on and used a good bit more fuel, doesn’t seem to bother my mates euro 4.
According to the link above its not corrosive at all.
My Link Above:
What if I spill AdBlue?
Don’t worry. You can rinse
it off with water.
With small spillages you may see white crystals forming after
a while but they are non-corrosive and can be wiped away.
It also says this
My Link Above:
Is AdBlue hazardous?
No. There have been some misplaced
concerns about AdBlue.
However, as we’ve seen, two-thirds of AdBlue
is water and the remaining third is an organic
compound. As such, it is less corrosive
than salt water to metal or concrete, and
it is neither toxic nor dangerous. AdBlue
is not ammonia — it’s a clean, harmless,
environmentally friendly solution. In fact,
of all of all the fluids used in a truck:
diesel, engine oil, battery acid, clutch
fluid and even windscreen washer
fluid, AdBlue is the least hazardous.