Porsche 928 GT1991, Owner'S Manual

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Cleaning and preserving engine compart-
ment
The engine compartment and the surface of
the engine are treated with a corrosion-inhibi-
tor at the factory.
If degreasing solvents are used to clean the
engine compartment or the engine is washed
down, the process almost invariably removes
the corrosion-inhibiting coating. It is then ab-
solutely necessary to have a durable preser-
vative applied to all surfaces, body seams,
joints and assemblies in the engine compart-
ment. This also applies when corrosion-in-
hibited parts are replaced.
Effective rust-proofing is particularly important
during the cold weather season. If your car is
driven frequently in areas where salt has
been spread on the roads, the whole engine
compartment should be cleaned thoroughly
after the winter to prevent salt causing any
lasting damage. A full underbody wash should
also be performed at the same time.
Windows
The road dust which settles on the windshield
and windows contains particles of tire rubber
and oil residue. The interior trim and
upholstery release particles, particularly in
strong sunlight, which collect on the insides of
the windows. These deposits are augmented
by impurities in the air which enters the car
through the fresh air vents.
The Porsche spray-on window cleaner can be
used to clean the windows, both inside and
outside. Remember to clean the wiper blades
as well and replace them once or twice every
year, depending on condition. If you use a
chamois leather for the windows, do not use it
for the paintwork as it will otherwise pick up a
certain amount of preservative or polish and
could smear the windows and thus impair vi-
sion.
Remove dead insects with the Porsche insect
remover.
Polishing
Do not resort to using Porsche polish until it
becomes evident that the normal preserv-
atives no longer produce the desired finish.
Caution: Do not apply silicone polishes to
the windshield or windows.
The paintwork of your car is exposed to all
manner of mechanical and chemical condi-
tions, particularly climatic ones such as bright
sunlight, rain, frost and snow. Ultraviolet light,
rapid changes in temperature, rain, snow, in-
dustrial dust and chemical deposits constantly
attack the paint which is only able to
withstand such exposure in the long term if it
is given regular care and attention.
Black matte finished parts should not be
treated with preservatives or polishes as this
will spoil the matte effect.
Spots and stains
Tar stains, grease, oil spots and dead insects
cannot always be removed by washing alone.
They can cause discoloration if allowed to re-
main on the paintwork. They should therefore
be removed without delay with Porsche Tar
Remover or Porsche Insect Remover.
Wash the affected area immediately after
treating it.
Minor paint damage
Minor paint damage, such as scratches,
scores or chips caused by flying stones,
should be covered immediately with the
Porsche Touch-up Applicator before corrosion
sets in. However, if there are already traces
of corrosion, they must first be removed care-
fully and thoroughly. Coat the area with a
rust-proofing primer and finish off with a top
coat. The paint code and color number are
found on the vehicle's paint data plate.
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