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mechanical modifications that can be made to lower the octane fuel
requirements of the engine in your car. These alterations are strictly
owner maintenance.
OIL DESIGNATIONS-The term "For Service ML", "For Service
MM", and "For Service MS or DG" are used by the oil industry to
designate the types of engine oils sufficient to meet the requirements of
various service conditions.
Petroleum based engine oils of type "MS or DG" as supplied by
reput-
able marketers are recommended for use in your new Pontiac engine.
S.A.E. OIL NUMBER SYSTEM - The numerical designations such
as lOW, 20W and 20, etc., adopted by the Society of Automotive
Engineers, classify lubricating oil only according to fluidity (viscosity).
The oils with the lower numbers are lighter and flow more readily
than do the oils with the higher
numbers.
The letter
"w"
after the
number indicates an oil adapted for cold weather
starting.
Multi-
viscosity type crankcase oils such as
5W-20,
lOW-20 and lOW-30 are
designed to combine the easy starting characteristics of the lower
number with the warm weather operating characteristics of the higher
number.
SELECTING OIL OF THE PROPER NUMBER-An oil should
be used which provides safe lubrication, satisfactory oil economy under
warm climatic conditions, and easy starting at the lowest atmospheric
temperatures expected during the period the oil is to remain in the
engine. Based on these considerations, engine oil numbers which are
recommended for the Pontiac engine for various climatic conditions
are as follows
:
A'mosph.r;e~T.mpe'ptures
Exe·etecl,
32°F. to 110°F.
10°F. 11 OOF.
10°F. below zero to 95° above zero
10°F. below zero and colder ....
S.A.E.
Num"",
Acceptable
Multigrade
1-__
-I10W-30
lOW-20
1----11
5W-20
NOI1:
Petroleum baled oils which are identified as "For Service MS
or
DG"
aN
recommended
for
the Pontiac Engine.
OIL CHANGE RECOMMENDATIONS-Engine oil should be
changed whenever it becomes contaminated. Contamination is usually
due to
the.
accumulation of water, dust or dirt, or the breakdown
products of the oil and fuel.
It is always advisable to drain the crankcase only after the engine
is thoroughly warmed. The benefit of draining is lost. to a large extent,
[38
J
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