Porsche 928 1982 Owner's Manual page 93

E n g i n e O i l s — petroleum based and/or synthetic based
Always use quality oil labeled "API Service SF
or SE". The terms SF or SE may appear on the
oil container singly or in combination with other
designations, for example: SE/CC, SF/CC or
SF/CD. Engine oils are graded according to their
viscosities. The grade to be used depends on
existing or anticipated seasonal climates. Refer
to the temperature chart when selecting engine
oil. If you need to add oil, it is permissible to mix
oil of different viscosities. As the temperature
ranges for different oil grades overlap, brief out-
side temperature variations are no cause for alarm.
When using SAE10 W or SAE 5 W-20 engine oil,
avoid high speed long distance driving if outside
temperature rises above the indicated limits.
Single grade oil
Porsche recommends the use of single grade oils
only if multi grade oils are not readily available.
However, engine oil changes must then be per-
formed according to seasonal temperature
changes to guard against engine damage.
Multi grade oil
For all year round driving use multi grade oil. Oil
change intervals specified in the Warrantiy &
Maintenance brochure accompanying the
vehicle must be adhered to, including inter-
vals for oil filter change.
Fuel-efficient-oil
For all year round driving a top quality "Fuel-ef-
ficient"-oil can have a benefical influence on fuel
economy. Before selecting these unconventional
oils, consult your Porsche dealer.
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