Porsche 928 ST1991 Owner's Manual page 67

Changing oil and filter
High quality multi-grade oils are suitable for
all year round driving. Seasonal oil changes
are therefore not necessary. Only if multi-
grade oils are not readily available, a single-
grade oil of the correct viscosity can be
used. Specifications of the various oils to be
used are detailed under "Filling Capacities
and Engine Oil". The use of oil additives is
not recommended by Porsche.
66
WARNING
• When removing oil drain plug with your
fingers, keep your arms as high as pos-
sible. This will prevent hot oil from run-
ning down your arm. Wear eye protection.
Before changing the engine oil yourself,
make sure that the disposal of the engine
oil and the oil filter as special wastes is
carried out in the proper manner. Do not
dump it on the ground, into open streams
or down sewage drains. Your zoning regu-
lations or environmental rules will tell you
how you can dispose of it. Should the dis-
posal of old engine oil present a problem,
we suggest that you
changed at your dealer or at a service sta-
tion.
Oil change intervals specified in the War-
ranty & Maintenance booklet accompanying
the vehicle apply to normal operating condi-
tions and must be adhered to, including in-
tervals for oil filter change.
If you drive mostly short distances, or if you
operate the vehicle in dusty areas, or under
predominantly stop-and-go traffic condi-
tions, or when temperatures remain below
freezing for extended periods, the engine oil
should be changed more frequently.
Changing engine oil
With the engine at operating temperature
and ignition off.
Remove the engine guard before working at
the bottom of the engine.
1. Loosen and remove oil filler cap.
2. Loosen oil drain plug (arrow) on oil pan
and allow oil to drain completely.
3. Loosen oil filter element with appropriate
wrench and remove.
4. Lightly coat new filter seal with oil.
5. Screw on new filter element until seal just
contacts the crankcase. Only hand-
have your oil
tighten according to filter manufacturer's
instructions on container or filter element.
6. Clean oil drain plug and replace, using a
new gasket. Do not overtighten the
plug.
7. Fill the crankcase with the required
amount of engine oil labeled "API Service
SF or SE" (see "Filling Capacities").
Do not overfill.
8. Reinstall oil filler cap and tighten securely.
9. Run engine at various speeds for 3 - 5 mi-
nutes and check for leaks. Check the oil
level with dipstick. Top up if necessary.
See "Cautions".