Winter Operation - Porsche 968 Driver Manual

I
Hints for Winter Operation
Engine Oil
If you use exclusively those oils listed in the
chapter "Engine Oils" you will be largely unaf-
fected by seasonal temperature changes.
Coolants
The antifreeze additive not only offers protection
against freezing at low temperatures but also
provides anti-corrosion protection for the engine
components, especially the aluminium parts.
Therefore, be sure never to drive without having
antifreeze added to the cooling water. The per-
manent cooling system filling from the factory
offers protection to -30°C/-22°F {Nordic coun-
tries -40°C/-40°F).
Check at the beginning of the winter whether
there is still enough antifreeze present; top up if
necessary. See mixture table in section "Filling
Capacities".
Brakes
After driving for extended periods on salt-covere-
d roads it is possible that a film will build up on
the brake discs and pads which considerably re-
duces friction and thus the braking efficiency.
78
The brake discs and brake pads should there-
fore be cleaned every two weeks or so with a
powerful water jet. The cleansing effect of auto-
matic car washes is insufficient.
Battery
When outside temperatures fall, the battery's ca-
pacity decreases while the load placed on it in-
creases considerably. Therefore, check the con-
dition of the battery in time and have it charged,
if necessary. Check also the electrolyte level
and apply terminal protecting grease to the con-
nectors. Also see "Checking and Servicing the
Battery".
Corrosion Protection
The salt spread on winter roads can have a det-
rimental effect on your car's bodywork. You
should therefore wash the car as often as con-
venient in accordance with our car care instruc-
tions. Have a preservative applied and the under-
seal checked by an Official Porsche Centre be-
fore and after the cold weather season.
Door Locks
In order to prevent the door locks from freezing,
tape the lock cylinders when washing your car
during the cold season. To open a frozen lock,
apply a commercial de-icer. Another solution is a
warmed-up key. Never apply any force.
..
Washer Reservoir
To ensure that the windscreen washer and the
headlight wa sher function even in freezing tem-
peratures, add Porsche Winter-Grade Wind-
screen Cleaner to the water in good time. This
cleaner will ensure clear vision down to -25°C.
Door, Roof, Lid and Window Seals
To prevent freezing of the rubber seals, it is rec-
ommended that the rubber be lightly coated with
either glycerine or talcum powder.