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GENERAL
MAINTENANCE
Fuel
Petrol
engines
Vehicles
with
catalyst
62 and 81 kW Fuel
injection
en
gines
Unleaded
regular
petrol
RON11 not
lower
than
91
rQp
On
vehicles
with
catalytic
con-
<35
verter
only
unleaded
petrol
may
be
used.
The
use of leaded petrol is very detrimental
to the functioning of the emission control
system
because the lead is deposited in the
catalytic converter.
rijK
Even
one
tankful
of
leaded
pet-
®5
rol
will
detract
from
the
effi
ciency
of the
catalytic
converter.
Although unleaded fuel may again be used
afterwards the original efficiency of the
catalytic converter is never fully attained.
On
vehicles
with
Lambda probe2' the mix
ture formation is also negatively affected.
11
Octane
Number, indicates the ignitability of
Diesel
2) Lambda = Air/petrol relationship Vehicles
without
catalytic
con
verter
62 kW
Carburettor
engine
unleaded
or leaded
regular
petrol
RON1) not
lower
than
91
i-Op
In the
interests
of our
environ-
ment
unleaded
petrol
should
be
used
whenever
possible.
Notes
• Unleaded petrol must comply
with
DIN3' 51 607 and leaded petrol
with
DIN 51 600.
• Only good quality petrol containing addi tives should be used - see also" Petrol addi
tives"
next column.
• If in an emergency the octane rating of the available petrol is lower than
that
required by the engine, only drive
with
me
dium engine speeds and low engine load
ing.
High
engine
loading
with
full
throttle
or
high
revs
can cause en
gine
damage.
Fill tank
with
petrol of the
correct rating as soon as possible.
31 Standards issued by the German Standards Institution.
Petrol
additives
The
quality of the fuel has a decisive influ
ence
upon the running behaviour, perform
ance
and service life of the engine. The addi
tives which are mixed into the petrol are of particular significance. One is advised
therefore only to use good
quality
pet
rol
containing
additives.
If such fuel is not available, or if engine
troubles such as starting difficulties, stalling during idling, vibration and loss of power
occur,
the appropriate additives should be
mixed
with
the petrol when filling the tank.
At temperatures between about 0 and 15
degrees
C, these additives prevent possible icing up of the carburettor, have an anti-cor
rosion effect, clean the fuel system and pre
vent deposits building up in the engine.
Petrol
additives available in accessory
outlets have not all shown themselves to be
effective. Therefore additives which have
been
tested for
Volkswagen
engines are av
ailable
from Volkswagen dealers in
Ger
many and in many export countries. The
Volkswagen
dealers are also informed
with
regard to the use of additives, and they know what to do in
cases
where deposits
have
already built up.
SB
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