Cadillac 1975 Owner's Manual page 66

'CATALYST CONTAINER
EXHAUST
GAS IN
INSULATlONjOXIDIZING BED
FIG. 5-3: CATALYTIC CONVERTER
UNIT—TYPICAL
FIG. 5-4: SCREW-ON FUEL CAP
Unleaded gasoline is used to reduce com¬
bustion chamber deposits, corrosion, and to
prevent lead contamination of the catalyst that
would render it ineffective. The use of leaded
fuel will reduce the effectiveness of the cataly¬
tic converter as an emission control device.
I
CAUTION: It is important to keep your j
engine properly tuned.
k_l
Carburetor Air Cleaner
When replacement is necessary, an AC
ACron air filter element is recommended.
j CAUTION: Do not remove the engine air
'
J
cleaner unless temporary removal is |
| necessary during repair or maintenance of |
I the vehicle. When the air cleaner is re-1
I moved backfiring can cause fire in the en- j
| gine compartment.
Engine Oil and
Filter Recommendations
Oil containers are labeled to indicate that
the oil meets or exceeds certain quality stan¬
dards. Oils labeled "SE" meet the lubricant
requirements specified for your engine.
Observe the following important oil and fil¬
ter recommendations:
• Use only SE engine oil.
• Change oil each 6 months or 7,500 mi les.
If more than 7,500 miles are driven in a
6-month period, change oil each 7,500
miles.
• Change oil each 3 months or 3,000 miles,
whichever occurs first, under the follow¬
ing conditions:
— driving in dusty conditions
— trailer pulling
— extensive idling
— Short-trip operation at freezing temp¬
eratures (engine not thoroughly
warmed-up).
• Operation in dust storms may require an
immediate oil change.
• Replace the oil filter at the first oil
change, and every second oil change
thereafter. AC oil filters provide excellent
engine protection.
See your Cadillac dealer for advice on the
frequency of oil and filter changes under un¬
usual driving conditions.
The above recommendations apply to the
first oil change as well as subsequent oil