brakes Seat Altea XL 2013 Owner's Manual

Table of Contents
Manual structure . . . . . . . . . . . . . . . . . . . . 5
Content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Safety First . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Safe driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Brief introduction . . . . . . . . . . . . . . . . . . . . . . . . . 7
Proper sitting position for occupants . . . . . . . . . 10
Pedal area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Storing objects . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Seat belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Brief introduction . . . . . . . . . . . . . . . . . . . . . . . . . 19
Why wear seat belts? . . . . . . . . . . . . . . . . . . . . . . 21
Seat belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Seat belt tensioners . . . . . . . . . . . . . . . . . . . . . . . 29
Airbag system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Brief introduction . . . . . . . . . . . . . . . . . . . . . . . . . 30
Front airbags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Side airbags* . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Curtain airbags . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Deactivating airbags* . . . . . . . . . . . . . . . . . . . . . . 44
Child safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Brief introduction . . . . . . . . . . . . . . . . . . . . . . . . . 46
Child seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Securing child seats . . . . . . . . . . . . . . . . . . . . . . . 51 Operating Instructions
. . . . . . . . . . . . . 55
Cockpit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Instruments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
LPG system* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Digital instrument panel display . . . . . . . . . . . . . 61
Instrument panel menus* . . . . . . . . . . . . . . . . . . . 68
Warning lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Steering wheel controls . . . . . . . . . . . . . . . . . . . . 91
General information . . . . . . . . . . . . . . . . . . . . . . . 91
Audio system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Radio navigation system . . . . . . . . . . . . . . . . . . . 95
Opening and closing . . . . . . . . . . . . . . . . . . . . . . 97
Central locking . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Radio frequency remote control . . . . . . . . . . . . . . 104
Anti-theft alarm system* . . . . . . . . . . . . . . . . . . . 106
Rear lid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Sliding/tilting sunroof* . . . . . . . . . . . . . . . . . . . . 112
Lights and visibility . . . . . . . . . . . . . . . . . . . . . . . . 115
Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Interior lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Visibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Windscreen wipers . . . . . . . . . . . . . . . . . . . . . . . . 127
Rear vision mirrors . . . . . . . . . . . . . . . . . . . . . . . . 131
Seats and storage . . . . . . . . . . . . . . . . . . . . . . . . . 134
The importance of correct seat adjustment . . . . . 134
Head restraints . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Front seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Rear seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Storage compartment . . . . . . . . . . . . . . . . . . . . . . 141 Ashtrays*, cigarette lighter* and electrical
sockets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
First-aid kit, warning triangle, fire extinguisher . 152
Luggage compartment . . . . . . . . . . . . . . . . . . . . . 153
Air conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
Climatic* . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
2C-Climatronic* . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
Steering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170
Ignition lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Starting and stopping the engine . . . . . . . . . . . . 172
Start-Stop function* . . . . . . . . . . . . . . . . . . . . . . . 176
Manual gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Automatic gearbox* / DSG automatic gearbox* . 180
Handbrake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Acoustic parking aid system* . . . . . . . . . . . . . . . 187
Cruise speed* (Cruise control system) . . . . . . . . 190
Practical Tips . . . . . . . . . . . . . . . . . . . . . . . . . 194
Intelligent technology . . . . . . . . . . . . . . . . . . . . . 194
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Anti-lock brake and traction control systems M-
ABS (ABS and ASR) . . . . . . . . . . . . . . . . . . . . . . . . 195
Electronic Stability Control (ESC)* . . . . . . . . . . . . 196
Driving and the environment . . . . . . . . . . . . . . . 202
Running-in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
Exhaust gas purification system . . . . . . . . . . . . . 203
Economical and environmentally friendly driving 204
Driving abroad . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
3
Table of Contents

89
Cockpit
Electronic Stability Control (ESC)*  / 
There are two control lamps for the electronic stability con-
trol. The  lamp provides information concerning the func-
tion and the  provides information on the disconnection
status
Both lamps come on together when the ignition is switched on and should
go out after approx. 2 seconds, which is how long the function check lasts.
This programme includes the ABS, EDL and ASR. This also includes the
brake assist system (BAS), automatic cleaning of the brake discs and the
trailer stability programme (TSP).
The warning lamp  has the following functions:
● It flashes whilst driving when the ASR/ESC is activated.
● It will light up continuously if there is a fault in the ESC.
● As the ESC operates in conjunction with the ABS, it will also light up if a
fault should occur in the ABS.
If the ESC control lamp  lights up and stays on after the engine is started,
this may mean that the control system has temporarily switched off the ESC.
In this case the ESC can be reactivated by switching the ignition off and
then on again. If the control lamp goes out, this means the system is fully
functional.
The  lamp provides information about the disconnection status of the
system:
● It stays lit when the ASR is disconnected when pressing the  switch.Differential lock fault (EDL)*The EDL operates along with the ABS in vehicles equipped
with the Electronic Stability Control (ESC)*
A malfunction in the EDL is indicated by the ABS control lamp . Take the
vehicle to a specialised workshop as soon as possible. For further informa-
tion on the EDL see ⇒ page 197, Electronic differential lock (EDL)*. 
Traction control system (ASR)*  / 
The traction control system prevents the driven wheels from
spinning when the vehicle is accelerating
There are two warning lamps for the traction control system:  and . Both
lamps come on together when the ignition is switched on and should go out
after approx. 2 seconds, which is how long the function check lasts.
The  lamp has the following function:
● It flashes when the ASR is working if the vehicle is moving.
If the system is deactivated or if it has any fault, the warning lamp will re-
main lit. The warning lamp will also light up if a fault should occur in the
ABS because the ASR operates in conjunction with the ABS. For further in-
formation, see ⇒  page 194, Brakes
The  lamp provides information about the disconnection status of the
system:
● It stays lit when the ASR is disconnected when pressing the ASR OFF
switch.
By pressing it again, the ASR function is reactivated and the warning lamp
switched off. 
Safety FirstOperating InstructionsPractical TipsTechnical Specifications

183
Driving
WARNING (Continued)
● The footbrake must not be held for a long period of time, not even
lightly; continuous braking will cause overheating of the brakes and a re-
duction or even a loss of braking power and a significant increase in
braking distances.
● Never allow the vehicle to coast down a gradient with the selector lev-
er in positions N or D, even when the engine is not running. For descents,
the use of the tiptronic programme is recommended to keep the speed
reduced.
CAUTION
● Never use the automatic gearbox to hold the vehicle stationary on a hill,
even for short periods, as this may overheat the gearbox and cause dam-
age. Apply the handbrake or depress the foot brake to hold the vehicle in
position.
● If the vehicle is allowed to roll with the engine stopped but the selector
in position N then the gearbox may be damaged because it will not be lubri-
cated. Changing gear in tiptronic mode*
The tiptronic system allows the driver to select gears man-
ually
Fig. 148 Changing gear
with tiptronic
Fig. 149 Steering wheel
with levers for automatic
gearbox
General information about driving in Tiptronic mode 
Safety FirstOperating InstructionsPractical TipsTechnical Specifications

185
Driving
Handbrake Using the handbrake
The handbrake should be applied firmly to prevent the vehi-
cle from accidentally rolling away.
Fig. 150 Handbrake be-
tween the front seats
Always apply the handbrake when you leave your vehicle and when
you park.
Applying the handbrake
– Pull the handbrake lever up firmly ⇒ Fig. 150.
Releasing the handbrake
– Pull the lever up slightly and press the release knob in the di-
rection of the arrow ⇒ Fig. 150 and guide the handbrake lever
down fully ⇒ 
. Always apply the handbrake
as far as it will go in order to prevent yourself
from driving with the handbrake applied by mistake ⇒ 
.
The handbrake warning lamp  lights up when the handbrake is applied
and the ignition switched on. The warning lamp turns off when the hand-
brake is released.
If you drive faster than 6 km/h (4 mph) with the handbrake on, the following
message* will appear on the instrument panel display: HANDBRAKE ON. You
will also hear an audible warning.
WARNING
● Never use the handbrake to stop the vehicle when it is in motion. The
braking distance is considerably longer, because braking is only applied
to the rear wheels. Risk of accident!
● If the handbrake is only partially released, this will cause the rear
brakes to overheat, which can impair the function of the brake system
and could lead to an accident. This also causes premature wear on the
rear brake pads.
CAUTION
Always apply the handbrake before you leave the vehicle. The first gear
should also be selected. 
Parking
The handbrake should always be firmly applied when the
vehicle is parked.
Always note the following points when parking the vehicle:
– Use the brake pedal to stop the vehicle. 
Safety FirstOperating InstructionsPractical TipsTechnical Specifications

194Intelligent technology
Practical Tips
Intelligent technology
Brakes Brake servo
The brake servo increases the pressure you apply to the brake pedal. It
works only when the engine is running .
If the brake servo is not functioning due to a malfunction, or if the vehicle
has to be towed, you will have to press the brake pedal considerably harder
to make up for the lack of servo assistance.
WARNING
The braking distance can also be affected by external factors.
● Never let the vehicle coast with the engine switched off. Failure to do
so could result in an accident. The braking distance is increased consid-
erably when the brake servo is not active.
● If the brake servo is not working, for example when the vehicle is be-
ing towed, you will have to press the brake pedal considerably harder
than normal.
 Hydraulic Brake Assist (HBA)*
The function (Hydraulic Brake Assist HBA) is only included in
vehicles with ESC.
In an emergency, most drivers brake in time, but not with maximum force.
This results in unnecessarily long braking distances.
This is when the brake assist system comes into action. When pressing the
brake pedal rapidly, the assistant interprets it as an emergency. It then very
quickly builds up the full brake pressure so that the ABS can be activated
more quickly and efficiently, thus reducing the braking distance.
Do not reduce the pressure on the brake pedal. The brake assist system
switches off automatically as soon as you release the brake.
Emergency braking warning
If the vehicle is braked suddenly and continuously at a speed of more than
80 km/h (50 mph), the brake light flashes several times per second to warn
vehicles driving behind. If you continue braking, the hazard warning lights
will come on automatically when the vehicle comes to a standstill. They
switch off automatically when the vehicle starts to move again. 

197
Intelligent technology
Electronic Stability Control (ESC*)
The ESC reduces the risk of skidding by braking the wheels individually.
The system uses the steering wheel angle and road speed to calculate the
changes of direction desired by the driver, and constantly compares them
with the actual behaviour of the vehicle. When irregularities occur, for exam-
ple, if the vehicle begins to skid, the ESC brakes the appropriate wheel au-
tomatically.
The forces acting on the braked wheel bring the vehicle back to a stable
condition. If the vehicle tends to oversteer, the system will act on the front
wheel on the outside of the turn.
Steering manoeuvre recommendations
This is a complementary safety function included in the ESC. This function
aids the driver to better stabilize the vehicle in a critical situation. For exam-
ple, in case of sudden braking surface with varied adherence, the vehicle
will tend to destabilise its trajectory to the right or to the left. In this case,
the ESC recognises the situation and assists the driver with a counter steer-
ing manoeuvre from the power steering.
This function simply provides the driver with a recommended manoeuvre in
critical situations.
The vehicle does not steer itself with this function, the driver has full control
of the vehicle at all times.
WARNING
● Remember that not even the ESC can defy the laws of physics. This
should be kept in mind, particularly on slippery and wet roads and when
towing a trailer.
● Always adapt your driving style to suit the condition of the roads and
the traffic situation. The greater safety provided by the ESC should not
encourage you to run any risks.
CAUTION
● To ensure that the ESC works correctly, all four wheels must be fitted
with the same tyres. Any differences in the rolling radius of the tyres can
cause the system to reduce engine power when this is not desired.
● Any modifications made to the vehicle (for example, to the engine,
brake system, running gear or to the combination of wheels and tyres) may
affect the operation of the ABS, EDL, ESC and ASR. 
Anti-lock brake system (ABS)
The anti-lock brake system prevents the wheels locking during braking
⇒ page 195. 
Electronic differential lock (EDL)*
The electronic differential lock helps prevent the loss of trac-
tion caused if one of the driven wheels starts spinning.
EDL helps the vehicle to start moving, accelerate and climb a gradient in
slippery conditions where this may otherwise be difficult or even impossi-
ble.
The system will control the revolutions of the driven wheels using the ABS
sensors (in case of an EDL fault the warning lamp for ABS lights up)
⇒ page 84.
At speeds of up to approximately 80 km/h, it is able to balance out differen-
ces in the speed of the driven wheels of approximately 100 rpm caused by a
slippery road surface on one side of the vehicle. It does this by braking the
wheel which has lost traction and distributing more driving force to the oth-
er driven wheel via the differential. 
Safety FirstOperating InstructionsPractical TipsTechnical Specifications

199
Intelligent technology
WARNING
● Even with all-wheel drive, you should always adjust your speed to
suit the conditions. Do not let the extra safety features tempt you into
taking any risks when driving. Failure to do so could result in an accident.
● The braking capability of your vehicle is limited by the tyres' grip. Ve-
hicle behaviour is no different from a vehicle without four-wheel drive. So
do not be tempted to drive too fast on icy or slippery roads just because
the vehicle still has good acceleration in these conditions. Failure to do
so could result in an accident.
● On wet roads bear in mind that the front wheels may start to aqua-
plane and lose contact with the road if the vehicle is driven too fast. If
this should happen, there will be no sudden increase in engine speed
when aquaplaning begins to warn the driver, as with a front-wheel drive
vehicle. For this reason and for that mentioned above, always choose a
driving speed suitable for the road conditions. Failure to do so could re-
sult in an accident.

Brakes
What factors can have a negative effect on the brakes?
New brake pads
New brake pads do not provide optimal performance during the first 400 km
(250 miles); first they must be “run in”. However, the reduced braking ca-
pacity may be compensated by pressing on the brake pedal a little harder.
Avoid overloading the brakes during run-in.
Wear
The rate of wear on the brake pads depends a great deal on how you drive
and the conditions in which the vehicle is operated. Negative factors are, for
instance, city traffic, frequent short trips or hard driving with abrupt starts
and stops. Wet roads or road salt
In certain conditions, such as in heavy rain, or after washing the vehicle or
driving through water, the full braking effect can be delayed by moisture (or
in winter by ice) on the discs and brake pads. In this case the brakes should
be dried by pressing the brake pedal several times.
The effectiveness of the brakes can also be temporarily reduced if the vehi-
cle is driven for some distance without using the brakes when there is a lot
of salt on the road in winter. In this case, the layer of salt on the brake discs
and pads has to wear off before braking.
Corrosion
There may be a tendency for corrosion to form on the discs and dirt to build
up on the brake pads if the vehicle is used infrequently or the brakes are
not used very often.
If the brakes are not used frequently, or if rust has formed on the disks, it is
advisable to clean off the pads and disks by braking firmly a few times at a
moderately high speed
⇒ 
.
Faults in the brake system
If the brake pedal travel should ever increase suddenly, this may mean that
one of the two brake circuits has failed. Drive immediately to the nearest
specialised workshop and have the fault repaired. Drive there slowly and re-
member that you will have to apply more pressure on the brake pedal and
allow for longer stopping distances.
Low brake fluid level
Malfunctions can occur in the brake system if the brake fluid level is too
low. The brake fluid level is monitored electronically.
Brake servo
The brake servo increases the pressure you apply to the brake pedal. The
brake servo works only when the engine is running. 
Safety FirstOperating InstructionsPractical TipsTechnical Specifications

200Intelligent technology
WARNING
● Apply the brakes heavily to clean the brake system only in a suitable
traffic situation. Be sure not to inconvenience or endanger other road
users. Risk of accident.
● Ensure the vehicle does not move while in neutral, when the engine is
stopped. Failure to do so could result in an accident.
CAUTION
● Never let the brakes “drag” by leaving your foot on the pedal when it is
not necessary to brake. This overheats the brakes, resulting in longer stop-
ping distances and greater wear.
● Before driving down a long, steep gradient, it is advisable to reduce
speed and change to a lower gear (or move the gear lever to a lower gear
position if your vehicle has an automatic gearbox). This makes use of en-
gine braking and prolongs the useful life of the brakes. If you still have to
use the brakes, it is better to brake firmly at intervals than to apply the
brakes continuously.
Note
● If the brake servo is not functioning due to a malfunction, or if the vehi-
cle has to be towed, you will have to press the brake pedal considerably
harder to make up for the lack of servo assistance.
● If you wish to equip the vehicle with accessories such as a front spoiler
or wheel covers, it is important that the flow of air to the front wheels is not
obstructed, otherwise the brakes can overheat. Power steering (servotronic*)
Power steering makes it easier to turn the steering wheel
when the engine is running.
Power steering assists the driver by reducing the force needed to turn the
steering wheel. In cars equipped with servotronic* power steering the de-
gree of power assistance is regulated electronically according to road
speed.
The power steering will keep on working even if the servotronic* device
fails. The degree of power assistance will, however, no longer adapt to dif-
ferent speeds. If the electronic regulating system is not working properly,
this is most noticeable when turning the steering wheel at low speeds (for
instance when parking), as more effort will be required than usual. The fault
should be corrected by a specialised workshop as soon as possible.
Power steering does not work if the engine is off. In this case the steering
wheel requires much more force to turn.
If the steering is held at its turning limit when the vehicle is stationary, this
will place an excessive load on the power steering system. Turning the
steering wheel to its limit places a load on the system, which causes noise.
It will also reduce the idling speed of the engine.
CAUTION
When the engine is running, do not turn the steering wheel to its limit for
more than 15 seconds. Otherwise, there is a risk of damaging the power
steering. 

202Driving and the environment
Driving and the environment
Running-in Running in a new engine
The engine needs to be run in over the first 1500 km
(1000 miles).
Up to 1000 kilometres (600 miles)
– Do not drive at speeds of more than 2/3 the maximum speed.
– Do not accelerate hard.
– Avoid high engine revolutions.
– Do not tow a trailer.
From 1000 to 1500 kilometres (600 to 900 miles)
– Speeds can be gradually increased to the maximum road speed
or maximum permissible engine speed (rpm).
During its first few hours of running, the internal friction in the engine is
greater than later on, when all the moving parts have bedded in.
For the sake of the environment
If the engine is run in gently, its life will be increased and its oil consump-
tion reduced. Braking capacity and braking distance
The braking capacity and braking distance are influenced by
driving situations and road conditions.
The efficiency of the brakes depends directly on the
brake pad wear. The
rate of wear of the brake pads depends to a great extent on the conditions
under which the vehicle is operated and the way the vehicle is driven. If you
often drive in town traffic, drive short distances or have a sporty driving
style, we recommend that you have the thickness of your brake pads
checked by a Technical Service more frequently than recommended in the
Service Plan.
If you drive with wet brakes, for example, after crossing areas of water, in
heavy rainfall or even after washing the vehicle, the effect of the brakes is
lessened as the brake discs are wet or even frozen (in winter). In this case
the brakes should be dried by pressing the brake pedal several times.
WARNING
Longer braking distances and faults in the brake system increase the risk
of accidents.
● New brake pads must be run in and do not have the correct friction
during the first 400 km (120 miles). However, the reduced braking ca-
pacity may be compensated by pressing on the brake pedal a little hard-
er. This also applies when the brake pads have to be changed further on.
● If brakes are wet or frozen, or if you are driving on roads which have
been salted, braking power may be lower than normal. 

203
Driving and the environment
WARNING (Continued)
● On steep slopes, if brakes are excessively used, they will overheat.
Before driving down a long steep slope, it is advisable to reduce speed
and change down into a lower gear or range (depending on the type of
transmission). This makes use of engine braking and relieves the brakes.
● Never let the brakes “drag” by applying light pressure. Continuous
braking will cause the brakes to overheat and the braking distance will
increase. Apply and then release the brakes alternately.
● Never let the vehicle run with the engine switched off. The braking
distance is increased considerably when the brake servo is not active.
● If the brake fluid loses its viscosity and is subjected to heavy use, va-
pour bubbles can form in the brake system. This reduces the efficiency of
the brakes.
● Non-standard or damaged front spoilers could restrict the airflow to
the brakes and cause them to overheat. Before purchasing accessories
please observe the relevant instructions ⇒ page 224, Technical modifi-
cations.
● If a brake system circuit fails, the braking distance will be increased
considerably. Contact a specialised workshop immediately and avoid un-
necessary journeys.

Exhaust gas purification system Catalytic converter*
To maintain the useful life of the catalytic converter
– Use only unleaded petrol with petrol engines, as lead damages
the catalytic converter.
– Do not let the fuel get too low in the tank. –
For engine oil changes, do not replenish with too much engine
oil ⇒ page 239, Topping up engine oil .
– Never tow the vehicle to start it, use jump leads if necessary
⇒ page 282.
If you notice misfiring, uneven running or loss of power when the vehicle is
moving, reduce speed immediately and have the vehicle inspected at the
nearest specialised workshop. In general, the exhaust gas warning lamp
will light up when any of the described symptoms occur ⇒ page 77. If this
happens, unburnt fuel can enter the exhaust system and escape into the en-
vironment. The catalytic converter can also be damaged by overheating.
WARNING
The catalytic converter reaches very high temperatures! Risk of fire!
● Never park where the catalytic converter could come into contact with
dry grass or flammable materials under the vehicle.
● Do not apply additional underseal or anti-corrosion coatings to the
exhaust pipes, catalytic converter or the heat shields on the exhaust sys-
tem. These materials could catch fire when the vehicle is being driven.
CAUTION
Never run the fuel tank completely dry because the irregularity of the fuel
supply may cause ignition problems. This allows unburnt fuel to enter the
exhaust system, which could cause overheating and damage the catalytic
converter.
For the sake of the environment
Even when the emission control system is working perfectly, there may be a
smell of sulphur from the exhaust gas under some conditions. This depends
on the sulphur content of the fuel used. Quite often the problem can be
solved by changing to another brand of fuel. 
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