Buick 1994 Skylark Owner's Manual page 218

NOTICE:
If
you use oils that do not have either the
"starburst" symbol or an API SH or SG
designation, you can cause engine damage not
covered by your warranty.
GM Goodwrench@ oil (in Canada,
GM
Engine Oil)
meets all the requirements for your vehicle.
Engine Oil Additives
Don't add anything to your oil. Your Buick dealer is
ready to advise if you think something should be added.
When to Change Engine Oil
See if any one of these
is
true for
you:
0
Most trips are less than
4
miles
(6
km).
0
,It's below freezing outside and most trips are less
The engine is at low speed most of the time
(as
in
0
You tow a trailer often.
Most trips are through dusty places.
If any
one of
these is true for your vehicle, then you
need
to
change your oil and filter every
3,000
'miles
(5 000
km)
or 3 months
--
whichever comes first.
If none
of them is true, change the oil every 7,500 miles
(12 500
km) or 12 months
--
whichever comes first.
Ckiange the filter at the first oil change and'at every
other oil change after that.
Engine Coolant Heater (Engine Block
Heater)
An engine coolant heater can be a big help if you have
to park outside in very cold weather, 0°F
(-
18 "C)
or
colder. If your vehicle has this option, see "Engine
Coolant Heater" in the Irtdex.
than
10
miles
(16
km).
door-to-door delivery, or in stop-and-go traffic).
31 L: