engine Seat Leon 2020 Owner's Guide

Practical tips
at least 30 seconds before starting the en-
gine
. When you then st
art the engine it may
take longer than normal (up to one minute)
to start firing. For the sake of the environment
Do not overfill the fuel tank, it may cause
the fuel t o o

verflow if it becomes warm. Note
There is no emergency mechanism for the
manual r el

ease of the fuel tank flap. If nec-
essary, request assistance from special-
ised personnel. Note
Diesel vehicles are fitted with a protective
de vice that pr

events the insertion of the
wrong fuel hose 1)
. It is only possible to re-
fuel with Diesel nozzles.

Checking and refilling levels
Super unleaded petrol 95 octane petrol or
normal 91 oct ane petr
ol at least
We recommend refuelling with super 95 oc-
tane petrol (91 AKI). If not available, normal 91
octane petrol (87 AKI) (with a slight power
loss) may be used.
Super unleaded petrol, 95 octanes at
least
You should use super 95 octane petrol (91
AKI) at least.
If super is not available, if necessary, use nor-
mal 91 octane petrol (87 AKI). In this case only
use moderate engine speeds and a light
throttle. Refuel with super as soon as possi-
ble.
Unleaded super plus 98 octane petrol or
super 95 octane petrol at least
We recommend refuelling with super plus 98
octane petrol (93 AKI). If not available: super
95 octane petrol (91 AKI) (with a slight power
loss).
If super is not available, if necessary, use nor-
mal 91 octane petrol (87 AKI). In this case only
use moderate engine speeds and a light
throttle. Refuel with super as soon as possi-
ble. CAUTION

Practical tips
Diesel  V
alid for: vehicles with diesel engines
Pl ease note the information on the inside of
the fuel tank flap.
We recommend you use Diesel according to
standard EN 590.
The diesel can thicken at very low tempera-
tures, thus affecting the start or operation of
the engine. Ask your service station attendant
if their diesel is suitable for winter use.
Water in the fuel filter 1)
If your vehicle has a diesel engine and is
equipped with a fuel filter with a water sep-
arator, the instrument panel may display the
following warning:

Checking and refilling levels

Flashes
Fault in the diesel engine management.
Hav e the engine check
ed as soon as possible by a
specialised workshop. Note
While the control lamps , ;,  or  are
on, ther
e might be faults in the engine, fuel
consumption may go up and the engine
might lose power. Catalytic converter
To maintain the useful life of the catalytic
conv
er

ter

Checking and refilling levels
Checking levels Fig. 223
Diagram for the location of the various el-
ements. From time to time, the levels of the different
fluids in the v
ehicl
e must be checked. Never
fill with incorrect fluids, otherwise serious
damage to the engine may be caused.
Coolant expansion tank ››› page 334
Engine oil level dipstick ››› page 333
Engine oil filler cap ››› page 333
Brake fluid reservoir ››› page 337
Battery 1)
››› page 338
1 2
3
4
5 Windscreen washer reservoir
› ›
› page 337 Note
The layout of parts may vary depending on
the engine . 6
Engine oil
Gener al not
es The engine comes with a special, multi-grade
oil that can be used all year r
ound.
Because the use of high-qualit

y oil is essen-
tial for the correct operation of the engine
and its long useful life, when topping up or
changing oil, use only those oils that comply
with VW standards. »1)
In plug-in hybrid vehicles (PHEV) the battery is
in the luggage compartment ››

› page 341
.
331

Practical tips
We recommend that the oil change be done
by a t echnical service or specialised w
ork-
shop.
If the engine oil level is too low
You can get information about the correct en-
gine oil for your vehicle at your workshop.
If the recommended engine oil is not availa-
ble, in the event of an emergency you can
change the oil once with a maximum of 0.5 L
of the next oil until the next oil change:
Petrol engines: standard VW 504 00,
VW 502 00, VW 508 00, ACEA C3 or
API SN.
Diesel engines: standard VW 509 00,
VW 507 00, VW 505 01, ACEA C3 or
API CK-4.
Have the oil changed by a specialised work-
shop.
SEAT recommends using original SEAT oil to
guarantee high SEAT engine performance.
Engine oil additives
No type of additive should be mixed with the
engine oil. The deterioration caused by these
additives is not covered by the warranty. CAUTION
Take the following into account if you have
r efill

ed with an engine oil different to those –
– specified in the aforementioned standards,
or by your SEAT t
echnical service centr

e:

Checking and refilling levels
WARNING
Observe the safety warnings ››
› in Con-
tr ol and w
arning lamps on page 91. Checking the engine oil level
Fig. 224
Engine oil dipstick. The engine oil dipstick indicates the level of
the oil.
Checking oil l
e

vel

Practical tips
The position of the oil filler opening is shown
in the corr esponding engine compartment il
-
lustration ››› page 331
.
Engine oil specification ››› page 331
. WARNING
Oil is highly inflammable! Ensure that no oil
comes int o cont

act with hot engine compo-
nents when topping up. CAUTION
If the oil level is above area ››

› Fig. 224
A ,
do not st ar
t the engine. This could result in
damage to the engine and catalytic con-
verter. Contact a specialised workshop. For the sake of the environment
The oil level must never be above zone
› ›

› Fig. 224
A . Otherwise oil can be drawn
in thr ough the cr
ankcase breather and leak
into the atmosphere via the exhaust sys-
tem. Note
Before a long trip, we recommend finding
an engine oil that conf orms t

o the corre-
sponding VW specifications and recom-
mend keeping it in the vehicle. This way, the
correct engine oil will always be available
for a top-up if needed. Engine oil change
We recommend that you have the engine oil
changed by a T
echnical Service

. WARNING
Only change the engine oil yourself if you
hav e the specialist kno

wledge required!

Checking and refilling levels
increased, but only up to 60 %; otherwise an-
tifr ee
ze protection will diminish and this will
worsen cooling.
When the coolant is topped up, use a mixture
of distilled water and at least 40 % of the
additive G12evo for optimal protection
against corrosion. Mixing G12evo with G13
(TL-VW 774 J), G12 plus-plus (TL-VW 774 G),
G12 plus (TL-VW 774 F), G12 (red) or G11
(green blue) engine coolants decreases pro-
tection again corrosion and should be avoi-
ded. WARNING
If there is not enough anti-freeze in the
cool ant syst

em, the engine may fail lead-
ing to serious damage.

Practical tips
Refilling coolant Fig. 227
In the engine compartment: marking
on cool ant e
xpansion tank. Fig. 228
Engine compartment: coolant expan-
sion t ank cap

. The coolant tank is located in the engine
compartment
››

› page 331
.
Top up coolant when the level is below the 
(minimum) mark. Checking coolant level