||
STARTING AND DRIVING
436
When driving short distances at low
speeds in a diesel car
The capacity of the diesel emission control sys-
tem is affected by how the car is driven. It is
important to drive varying distances at different
speeds to achieve optimal performance.
Driving short distances at low speeds (or in cold
climates) frequently, where the engine does not
reach normal operating temperature, can lead to
problems that can eventually cause a malfunction
and trigger a warning message. If the vehicle is
mostly driven in city traffic, it is important to regu-
larly drive at higher speeds to allow the diesel
emission control system to regenerate.
•
The car should be driven on A-roads at
speeds in excess of 60 km/h (38 mph) for at
least 20 minutes between each refuelling.
Related information
•
Diesel (p. 434)
•
Emission control with AdBlue® (p. 436)
•
Fuel consumption and CO2 emissions
(p. 626)
Emission control with AdBlue®
10
AdBlue is an additive used in the SCR
11
system
to reduce emissions of noxious substances from
a diesel engine.
In the SCR system, the AdBlue and the nitrous
oxide exhaust gas substance are converted to
nitrogen and water vapour, which significantly
reduces the emissions of harmful nitrous oxides.
AdBlue
AdBlue is a colourless fluid that consists of
32.5% urea
12
in deionised water and is produced
in accordance with the ISO 22241 standard. It is
specially developed for SCR cleaning technology
for diesel engines.
AdBlue has its own tank in the car and is topped
up via a separate filler pipe behind the fuel filler
flap. Consumption depends on driving style, out-
side temperature and the operating temperature
of the system.
Conditions for driving with AdBlue
There must always be AdBlue of the correct
quality in the tank before the car can be started.
The SCR system is very sensitive to contami-
nants.
The emission control system continuously moni-
tors the tank level, quality and dosage of AdBlue.
If something is wrong, a message is shown in the
driver display.
IMPORTANT
AdBlue is required for the function of the
SCR system and legal emissions compliance.
It is illegal to modify or manipulate the AdBlue
supply system in any way so that no AdBlue
reagent is consumed when it is required for
legal exhaust emissions compliance. Any
such tampering may be a criminal offence
which may lead to legal prosecution actions.
It is not permitted to operate the car with an
empty AdBlue tank, since it will no longer be
compliant with the legal requirements for
exhaust emissions. Therefore, the car is
equipped with a warning system to inform
when AdBlue refilling is required. When the
fill level in the AdBlue tank is getting low,
warnings are displayed to inform that AdBlue
refilling is needed.
Related information
•
Handling AdBlue® (p. 437)
•
Checking and filling with AdBlue® (p. 437)
•
Symbols and messages for AdBlue®
(p. 440)
10
Registered trademark that belongs to Ver-band der Automobilindustrie e.V. (VDA)
11
Selective Catalytic Reduction
12
CO(NH
2
)
2
To Next Page
Loading...
