Selecting Oil With The Proper Number; Engine Oil Chart; Engine Oil In Your New Car; When To Change Oil - Pontiac 1953 Owners Service Manual

SELECTING OIL WITH
THE PROPER NUMBER
(VISCOSITY)
- It is
important to use oil of the
proper number suitable for
the climatic conditions you
expect to encounter during
the period the oil is to be
in the engine. The oil chart
shown here makes this
selection easy since the
atmospheric temperature
range over
which
each oil
should be used is shown
graphically.
ENGINE OIL CHART
(OIL NUMBERS AR E S. A. E. SP ECIFI CATIONS)
Thi, chert i"dicoles the atmospheric temperature rongru
over which the various glades of oil ore recommended .
110° F. Temperotu,e shown
01
bottom
T
Ii'
9 5
0
f
of
, e och glode
j~
the lowesl 01
Jt?JI.. .
which emy
S'(IfIHlg
con
be e~-
20· W
>
f
peeled when thol grade is used.
or
T
~
20 .
~
NOTE: 10.W plus kerosene is
20-
>'
recommended only for rhose
I ; ;
1. . . . . .
""ito,;e5
where the ,;mpcroturc ~
\ follsb e lowminusl0 F. forpro .
;~-
. ;:. haered periods.
Where
ovoil.
. 'D-W
able S.W oil may
32' F. ·~
I
20'" F. be
ul1~d instead of
", "i:
~
10.Wplusl0%ker.
.
~
OSene under those
ZER O 1 0" F. :r 10-W
climotlc condition\
m
:
Plus
1 0%
where the lotte'
_ 100
F
Kerosene lubricont is recom ·
.
¥.~""""
mended (Kerosene
FREEZING
....::sL..
F
or other diluents
- 30
0
•
shouldno t beodded
to s -W.)
IMPOR TANT- When using S·W it is odyisoble ro check
rhe oil level or more Irequenr inrelVols rhon usual wirh
heavier bodied oils.
ENGINE OIL IN YOUR NEW
CAR-During the first 1,000
miles, use the oil in the crankcase as received from the dealer_
(Special "break·in" oils are unnecessary. They should not be used
under any circumstances unless the manufacturer can furnish
satisfactory proof that the compound contains no harmful sub·
stances.) At the end of the first 1,000 miles, the crankcase should
be drained and refilled to the proper level with an oil suitable
for your individual climatic and driving conditions. Should it be
necessary to add or change engine oil during the first 1,000 miles,
an oil not hea vier than lO·W should be used.
WHEN TO CHANGE OIL-For
normal driving conditions, an oil
change is recommended every 3,000 to 4,000 miles. This applies
to all owners with the exception of those driving under conditions
shown below.
It is always advisable to drain the crankcase only
a fter .the engine
is thoroughly warmed. The benefit of draining is lost, to a large
extent, if the
cra nkcase is drained when the engine is cold as cold
oil will not drain thoroughly.
Driving in Dust-When
the car is generally operated in dusty
territory, consideration should be g iven to more frequent oil changes.
Short Runs in Cold
Weather- Short runs in cold weather (freezing
temperatu res or lower) such as city driving does not permit the
thorough warming up of the engine. and water may accumulate in
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