2013 Seat Mii engine

177
At the filling station
Fuel
Introduction
You will find a factory-fitted sticker containing information on the type of
fuel for your vehicle on the inside of the fuel tank flap.
Additional information and warnings:
● ⇒ Booklet Maintenance Programme
● Refuelling ⇒ page 171
● Electronic power control and exhaust gases purification system
⇒ page 237
WARNING
Refuelling or handling fuel carelessly can cause an explosion or fire re-
sulting in serious burns and injuries.
● Fuel is a highly explosive, easily flammable substance.
● Observe current safety instructions and local regulations concerning
the handling of fuel.

Types of fuel
The type of fuel to use when refilling will depend on the vehicle's engine.
You will find a factory-fitted sticker containing information on the type of
fuel for your vehicle on the inside of the fuel tank flap.
SEAT recommends the use of sulphur-free or low sulphur fuel to reduce con-
sumption and prevent engine damage.
Possible types of fuelAlternative namesFurther information
91a)
RONNormal petrol, normal unlea-
ded petrol
⇒ page 17795 a)
RONPremium unleaded petrol (95
RON)
98 a)
RONPremium unleaded petrol (98
RON)
a) RON = Regulation Octane Number 
Petrol
Petrol types
Vehicles with petrol engines must refuel using unleaded petrol according to
European norm EN 228 ⇒ 
.
Petrol types are categorised according to their octane number (e.g. 91, 95,
98 or 99 RON (RON = “Research Octane Number”). You may use petrol with
a high octane number than the one recommended for your engine. Howev-
er, this has no advantage in terms of fuel consumption and engine power.
SEAT recommends refuelling with a low sulphur content or sulphur-free pet-
rol to reduce fuel consumption for petrol engines.
Petrol additives
The quality of the fuel influences the behaviour, performance and service
life of the engine. This is why the petrol you use should carry suitable addi-
tives already included by the petrol industry, free of metals. These additives
will help to prevent corrosion, keep the fuel system clean and prevent de-
posits from building up in the engine.
If good quality petrol with metal-free additives is not available or engine
problems arise, the necessary additives must be added when refuelling
⇒ 
. 
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178At the filling station
Not all petrol additives have been shown to be effective. The use of unsuita-
ble petrol additives may cause significant damage to the engine and the
catalytic converter. Metal additives should never be used. Metal additives
may also be contained in petrol additives for improving anti-detonation rat-
ings or octane ratings ⇒ 
.
SEAT recommends “genuine Volkswagen Group fuel additives for petrol en-
gines”. These additives can be bought at SEAT Authorised Services, where
information on how to use them can also be obtained.
CAUTION
● Do not refuel if the filler indicates that the fuel contains metal. LRP (lead
replacement petrol) fuels contain high concentrations of metal additives.
Using them may damage the engine!
● Only use fuel with an octane rating that is in line with the norm EN 228,
otherwise significant damage could be caused to the engine and fuel sys-
tem. Furthermore, it could lead to a loss of performance with the conse-
quent engine fault.
● The use of unsuitable petrol additives could seriously damage the en-
gine and the catalytic converter.
● If, in exceptional circumstances, petrol with a lower octane rating to that
recommended is used, only use moderate engine speeds and a light throt-
tle. Avoid using full throttle and overloading the engine. Otherwise engine
damage may occur. Fill up with fuel of a suitable octane rating as soon as
possible.
● Just filling one full tank of leaded fuel or with other metal additives
would seriously impair the efficiency of the catalytic converter and could
damage it. 
Natural gas
Natural gas, in addition to others, can be in liquid form. Liquefied natural gas (LNG) is the result of heavy cooling of natural gas.
Therefore its volume is considerably reduced compared with compressed
natural gas (CNG). In vehicles with a natural gas engine, liquefied natural
gas cannot be directly refilled, given that the gas would expand excessively
in the vehicle gas tank.
Therefore, vehicles with a natural gas engine must only be refuelled using
compressed natural gas
⇒ 
.
Natural gas quality and consumption
Natural gas is divided into the groups H and L depending on its quality.
Gas type H has a superior heating power and inferior nitrogen and carbon
dioxide content than type L. The higher the heating power of the natural
gas, the lower the consumption will be.
However, the heating power and the proportion of nitrogen and carbon di-
oxide can fluctuate within the quality groups. Therefore, vehicle consump-
tion can also vary when using one type of gas only.
The engine management automatically adapts to the natural gas used ac-
cording to its quality. Therefore, different quality gases can be mixed in the
tank, without the need for comprehensive draining before applying a differ-
ent quality gas.
Natural gas and safety
If you can smell gas or suspect that there is a leak ⇒ 
:
● Stop the vehicle immediately.
● Switch the ignition off.
● Open the doors to appropriately ventilate the vehicle.
● Immediately extinguish cigarettes.
● Move away from the vehicle or switch off objects that may cause sparks
or a fire.
● If you continue to smell gas, do not continue driving!
● Seek specialist assistance. Have the fault repaired. 

180In the engine compartment
Care, cleaning and maintenance
In the engine compartment
Working in the engine compartmentIntroduction
Before working in the engine compartment, make sure that the vehicle is
parked on horizontal and firm ground.
The engine compartment of the vehicle is a hazardous area. Never work on
the engine or in the engine compartment if you are not familiar with the op-
erations to be carried out, the applicable safety standards and especially if
you do not have the instruments, liquids and tools necessary ⇒ 
! In such
a case, have any work carried out by a Specialised workshop. Negligent
work can cause serious injury.
Additional information and warnings:
● Exterior detail ⇒ page 6
● Windscreen wash system ⇒ page 89
● Start and stop the engine ⇒ page 119
● Brake fluid ⇒ page 134
● Checks when filling up ⇒ page 171
● Engine oil ⇒ page 185
● Engine coolant ⇒ page 189
● Vehicle battery ⇒ page 193
● Accessories, parts replacement, repairs and modifications ⇒ page 222
WARNING
If the vehicle moves unexpectedly, this could cause serious injury.
● Never work underneath the vehicle if it is not secured against moving.
If you must work underneath the vehicle with the wheels in contact with
the ground then it should be parked on flat ground, the wheels should be
prevented from moving and the key must be removed from the ignition.
● If you have to work underneath the vehicle, you must use suitable
stands additionally to support the vehicle, there is a risk of accident!.
The jack is not intended for this kind of work and its failure could lead to
severe injuries.
● Disconnect the Start-Stop system.
WARNING
The engine compartment is a dangerous area capable of causing serious
injury.
● For all type of work, always take the utmost precautions, work care-
fully and note the general safety standards in force. Never take personal
risks.
● Never work on the engine or in the engine compartment if you are not
familiar with the necessary operations. If you are not sure about proce-
dures then visit a specialised workshop to carry out the necessary work.
Incorrect work can cause serious injuries. 

181
In the engine compartment
WARNING (Continued)
● Never open the bonnet if you see steam or coolant escaping from the
engine compartment. Hot vapours and coolant can cause serious burns.
Always wait until you cannot see or hear the sound of steam or coolant
coming from the engine compartment.
● Always allow the engine to cool down before opening the bonnet.
● Contact with hot elements of the engine and the exhaust system can
cause burns.
● Once the engine has cooled, follow the instructions below before
opening the bonnet:
–Engage the handbrake and place the gear selector lever in P or the
gear stick in neutral.
– Remove the key from the ignition.
– Keep children away from the engine compartment and never leave
them unsupervised.
● When the engine is warm or hot, the cooling system is pressurised.
Do not unscrew the cap on the expansion tank when the engine is hot.
Otherwise, coolant may spray out under pressure causing burns and seri-
ous injury.
–After cooling, carefully and slowly unscrew the cap anticlockwise,
gently pressing down on it.
– Always protect your face, hands and arms from hot coolant and
steam using a large, thick cloth.
● When refilling liquids, avoid spilling them on parts of the engine and
the exhaust system. Spilled liquids could cause a fire.WARNING
The high voltages of the electrical system can give electric shocks as well
as causing burns and serious injury and possibly even death!
● Never cause short circuits in the electrical system. The battery could
explode.
● To minimise the risk of electric shock and serious consequences
while the engine is running or starting the engine, note the following:
–Never touch the electrical wiring of the ignition system.
WARNING
In the engine compartment, there are rotating parts that could cause se-
rious injury.
● Never place your hands directly on or near the radiator fan. Touching
the rotor blades could seriously harm you. The ventilator works accord-
ing to the engine temperature and could start suddenly even when the ig-
nition is turned off and the key is removed.
● If any work has to be performed when the engine is started or with
the engine running, there is an additional, potentially fatal, safety risk
from the rotating parts, such as the drive belts, alternator, radiator fan
etc as well as from the high-voltage ignition system. Always work with
the utmost caution.
–Always make sure that no parts of your body, jewellery, ties, loose
clothing and long hair can be trapped by the rotating parts of the en-
gine. Before any work, remove ties and jewellery ( necklaces, etc), tie
longhair back and tie all items of loose clothing to your body to make
sure that they cannot be trapped by engine components.
– Take extreme caution when operating the accelerator and remain
attentive. The vehicle could move, even if the handbrake is applied.
● Always make sure you have not left any objects, such as cloths or
tools, in the engine compartment. If any object is left in the engine com-
partment, this could cause malfunctions, engine faults and even a fire. 
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182In the engine compartment
WARNING
Refill liquids and certain materials can catch fire easily in the engine
compartment, causing a fire and serious injury!
● Never smoke.
● Never work close to places exposed to flames or sparks.
● Never pour service fluids over the engine. These fluid may ignite hot
engine parts and cause injuries.
● If it is necessary to work on the fuel system or the electrical system,
please follow the instructions below:
–Always disconnect the vehicle battery.
– Never work close to heaters, heat sources or places exposed to
flames or sparks.
● Always keep a recently serviced and perfectly working fire extin-
guisher close by.
CAUTION
When refilling or changing service liquids, ensure that you put the liquids
into the right tank. Making a mistake when refilling could cause serious
malfunctions and damage the engine!
For the sake of the environment
Service fluids leaks are harmful to the environment. For this reason you
should make regular checks on the ground underneath your vehicle. Take
the vehicle to a specialised workshop to be checked if you see stains, oil or
other fluids on the ground. Collect any spilt service fluids and allow a pro-
fessional to dispose of them. Preparing the vehicle for work in the engine compartment
Checklist
Carry out the operations below in the order indicated before starting work in
the engine compartment
⇒ 
:
 Park the vehicle on an even and solid surface.
 Press and hold the brake pedal until the vehicle comes to a stand-
still.
 Apply the handbrake firmly
⇒ page 134.
 Move the gear lever into the neutral position
⇒ page 124.
 Stop the engine and remove the key from the ignition
⇒ page 119.
 Wait for the engine to cool down.
 Always keep children and other people far from the engine compart-
ment.
 Ensure that the vehicle can not move off unexpectedly.
WARNING
Always complete the operations given in the checklist and observe the
general rules of safety.
● Ignoring this checklist, drawn up for your own safety, could result in
serious injury.


183
In the engine compartment
Opening and closing the bonnet
Fig. 112 A: Release lever in the footwell on the driver
side B: Release lever on the bonnet
Fig. 113 C: Bonnet securing rod in the bonnet. D: Bon-
net supported by the bonnet securing rod 
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184In the engine compartment
Opening the bonnet
● Before opening the bonnet, make sure that the windscreen wiper arms
are in place against the windscreen ⇒ 
.
● Pull the release lever 1 in the direction of the arrow
⇒ Fig. 112 A. The
bonnet is released from the lock carrier by a spring mechanism ⇒ .
● Lift the bonnet up slightly while pressing the release lever 2 B in the
direction of the arrow to completely open the bonnet.
● Take out the bonnet support rod from its clip in the direction of the ar-
row 3
C and place it in the corresponding open position 4 D (arrow).
Closing the bonnet
● Slightly lift the bonnet ⇒ 
.
● Take out the bonnet support rod from the opening catch 4 D and insert
it into its clip 3 C in the opening catch.
● Let the bonnet fall from a height of 30 cm into its clip; Do not apply pres-
sure!
If the bonnet is not correctly closed, open it once again and close it correct-
ly.
The bonnet is correctly closed when it is flush with the corresponding parts
on the bodywork.
WARNING
If the bonnet is not correctly closed, it could suddenly open while driving
leaving the driver without visibility. This could result in a serious acci-
dent.
● After closing the bonnet, always check that it is properly secured by
the locking mechanism in the lock carrier piece. The bonnet must be
flush with the surrounding body panels.
● While driving, if you notice that the bonnet is not correctly closed
then stop immediately and close it correctly.
● Only open and close the bonnet when there is nobody within its
range.
CAUTION
● To avoid damage to the bonnet and to the windscreen wiper arms, only
open the bonnet when the windscreen wipers are in place against the wind-
screen.
● Before driving, always lower the wiper arms. 

185
In the engine compartment
Engine oil Introduction
Additional information and warnings:
● ⇒ Booklet Maintenance Programme
● Working in the engine compartment ⇒ page 180
● Accessories, parts replacement, repairs and modifications ⇒ page 222
WARNING
Incorrectly handling engine oil can cause injury and serious burns.
● Always protect your eyes when handling engine oil.
● Oil is toxic and must be kept out of the reach of children.
● Engine oil must only be kept closed in its original container. The same
applies to use oil until it has been disposed of.
● Never store engine oil in empty food containers or bottles as other
people may accidentally drink it.
● Regular contact with engine oil can be bad for the skin. If you come
into contact with engine oil, wash your skin with soap and water.
● With the engine running, the engine oil gets extremely hot and can
cause severe skin burns. Always wait until the engine has fully cooled.
For the sake of the environment
Similar to the other service liquids, spilled engine oil can be bad for the en-
vironment. Collect any spilt fluids in suitable containers and dispose of in
accordance with legislation and with the utmost respect for the environ-
ment. Warning and control lamps
flashesPossible causeSolution
Engine oil pressure too low.

Stop the vehicle!
Switch off the engine. Check the
engine oil level, and if necessa-
ry, refill with ⇒ page 186.
engine oil - If the warning indica-
tor flashes although the oil level
is correct, do not continue driv-
ing or leave the engine running.
Otherwise, the engine could be
damaged. Seek specialist assis-
tance.
WARNING
If the warning lamps are ignored, the vehicle may stall in traffic, or may
cause accidents and severe injuries.
● Never ignore the warning lamps.
● Stop the vehicle safely as soon as possible.
CAUTION
Failure to heed the warning lamps when they appear may result in faults in
the vehicle. 
Engine oil specifications
Replacement engine oil must strictly comply with the specifications. 
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