tire type Alfa Romeo 166 2006 Owner handbook (in English)

Under no circumstances
should conventional
leaded petrol be used
as this would irreparably dam-
age the catalyst. if the tank is
accidentally filled with leaded fu-
el, even in minute quantity, DO
NOT START THE ENGINE. Do not
attempt to dilute the petrol with
lead free fuel. Drain the entire
fuel circuit and tank.The car must only be
filled with diesel fuel
for motor vehicles, in
compliance with European Stan-
dard EN590. The use of other
products or mixtures may ir-
reparably damage the engine
with invalidation of the warran-
ty due to the damage caused. In
the event of accidentally filling
with another type of fuel, do not
start the engine and empty the
tank. If the engine has been run
even for only a very short time,
in addition to the tank, it is also
necessary to drain out the whole
fuel circuit.DIESEL ENGINES
124
The anti-pollution de-
vices present on the ve-
hicle impose the use of
four-star unleaded fuel with an
octane number (R.O.N.) above 95.
If the catalyst is not
working properly harm-
ful emissions reach the
exhaust resulting in environment
pollution.
REFUELLING
PETROL ENGINES
In order to prevent the vehicle being
Filled with leaded petrol the diameter of
the filler neck is smaller than the nozzle
used on pumps delivering leaded petrol.

146
A - Normal pressure: tread uniform-
ly worn.
A correct pressure will ensure a longer
life for your tyre and improve perfor-
mance as the tread will then be working
along the entire width of the tread and
wear will be more uniform.
These conditions also lead to:
– better road holding of the vehicle
– easier and more precise steering
– reduced fuel consumption due to a
lower resistance against the rolling of the
tyre.
B - Insufficient pressure: tread
worn more along the edge.
Low tyre pressure will cause irregular
wearing of the tread (greater along the
sides) and cause the tyre to overheat
which could lead to parts of the tyre
breaking off and cause damage to the
shell of the tyre itself.
This type of damage could lead to sud-
den loss of pressure or cause the tyre to
burst.C - Excessive pressure: tread worn
more towards the centre.
Overinflating the tyres leads to:
– irregular wearing of the tread, con-
centrated more towards the centre of the
tread
– a reduction in the level of comfort
– a greater vulnerability of the tyre to
knocks
IMPORTANT When the vehicle is be-
ing used the pressure increases naturally.
In exceptional cases when checking tyre
pressure when hot, do not reduce the
pressure.Wheel balancing
Each wheel together with its tyre is bal-
anced, both satirically and dynamically, in
the factory. When the tyres are replaced
the wheels must be rebalanced to prevent
vehicle instability, wearing of the compo-
nents of the steering system and irregular
tyre wear.
When balancing wheels
made of light alloy only
original Alfa Romeo
counterweights should be used.