Porsche 928 S4 – Owner’s Manual |
|||||||||||||||||||||||||||||||||||||||||||
|
Model Year 1987 From
the “Porsche 928 S4 Owner’s Manual”, available from 928 Specialists. |
(Average
values)
Use
only engine oils which meet the specifications designated by PORSCHE. Your Porsche dealer will be glad to
advise you on the correct type of oil for your engine. All current engine oils are
compatible with each other, i.e. when making an oil change it is not
necessary to flush the engine if you wish to use a different brand or grade
of oil. Since, however, each
brand of oil has a special composition, you should, if possible, use the same
oil brand if it becomes necessary to top up between oil changes. PORSCHE engines have long intervals
between oil changes. You can
make best use of these long oil change intervals by using multigrade oils
since these are largely independent of seasonal fluctuation in temperature. If
your vehicle is used frequently in stop-and-go traffic in winter, the engine
will not always be properly warmed up.
Condensation from products of combustion may accumulate in the
oil. In this case, it is
advisable to change the oil in spring so that your engine once again has a
100% efficient engine oil. Engine oil performance
class Engine
oil is not only a lubricant, but also servers to keep the engine clean, to
neutralize the dirt which penetrates into the engine through combustion and
to protect the engine against corrosion. To perform these functions, the oil is provided with
additives which have been specially developed for these functions. So-called mineral oils are produced
directly from crude oil. The
oils can be further refined or totally converted through a number of chemical
processes. These oils are
structurally more efficient and require fewer additives than simple mineral
oils. The
efficiency of an oil is expressed, for example, by the API classifications
which are divided into categories “S” and “C”. The degrees of quality are expressed by final letters in
alphabetical order. The
requirements for PORSCHE engines are API class SE/CC to SF/CD. Viscosity
Like
all liquids, engine oil is viscous when cold, and thin-bodied when warm. The viscosity of an oil is expressed
by its SAE class. For cold
viscosity (measured at temperatures below 0°C) the SAE class given as
a number and the letter “W” (as in winter), for hot viscosity (measured at
100°C)
the SAE class is given only as a number. The
viscosity of an oil is, therefore, always the same if it has the same number
of an SAE class. E.g.:
A 10 W-30 oil and a 10 W-40 oil have the same viscosity when cold (below 0°C); when hot (at 100°C) the oil with the number
30 is thinner than the oil with the number 40. Single-grade/multigrade oils
Oils
with two viscosities are called multigrade oils; oils with only on viscosity
are termed single-grade oils. Single-grade
oils can only be used for the narrow temperature range identified by their
SAE number; multigrade oils cover a wider temperature range. Fuel-efficient-oils
Fuel-efficient-oils
reduce internal friction in the engine.
PORSCHE approves only fuel-efficient-oils which are structurally so
stable that they can be used in PORSCHE engines both as summer and winter
oils (see chart of areas of application for oils of different viscosity). These conditions are currently
fulfilled by synthetic of hydrocrack fuel-efficient-oils. Engine
– Full power curves [chart] Transmission
Diagram Manual
gearbox [chart] Transmission
Diagram Automatic [chart] |
||||||||||||||||||||||||||||||||||||||||||
|
|
|
||||||||||||||||||||||||||||||||||||||||||