Cadillac 1937 LaSalle VVI Information page 258

170
L U B R I C A T I O N
During warm weather, engine oil can be selected
upon the basis of the type of driving. For moderate
driving, S A E 30 oils should be used. For high speed
driving, heavy duty oils of S A E 40 or 50 grade will
provide better oil mileage than will the lighter grade.
During cold weather, engine oil selection should
be based primarily upon 'easy starting character-
istics, which depend upon-the viscosity (fluidity) of
the oil at low temperatures. The diagram at the right
indicates the temperature ranges within which each
grade can be relied upon to provide easy starting
and satisfactory lubrication. *
O n l y 20 W and 10 W oils are suitable for use
when weather conditions are below 30° F. The
reason for this is that the viscosity limits of 20 W
and 10 W are taken at a temperature of 0° F.,
whereas those of S A E 20, 30, and 40, all of which
are summer grade oils, are taken at a temperature
of
130°
F.
When the crankcase is drained anct'refilled, the
oil should be selected, not on the basis of the exist-
ing temperature at the time of change, but on the
anticipated minimum temperature for the period dur-
ing which the oil is to be used. Otherwise, starting
difficulty will be experienced at each sudden drop
in temperature.
Heavy duty oils may be used in cold weather if
the car is kept in a heated garage or if the heavy
duty oil has a cold viscosity sufficiently low to avoid
S.A.E-30
2 0 - W - <
I 0 - W +
1 0 % K E R O S E N E
M O
H
1 0 0
9 0
8 0
7 0
6 0
5 0
4
V 4 0 4
3 0
r
2 0
rs
-10-
-20
^-30-1
A.E-40
VS.A.E-20
f -tio-w
Winter oils should be selected on the
basis of the lowest temperature expected
hard starting. Otherwise, 20 W or 10 W oils must
be used and the oil level checked more frequently
on high speed drives, as the rate of consumption
will be higher than at moderate speeds.
Specifications covering the composition and qual-
ity of engine oils can be secured on request to the
factory Service Department.
Viscosity
Number
VISCOSITY ( S A Y B O L T U N I V E R S A L )
Viscosity
Number
0°F.
1 30°
F.
210°
F.
Viscosity
Number
M i n .
M a x . M i n .
M a x . M i n .
M a x .
10-W(*)
20-W
(**)
S. A . E.
20
S. A . E.
30
S. A . E.
40
5,000
10,000
10,000
40,000
10-W(*)
20-W
(**)
S. A . E.
20
S. A . E.
30
S. A . E.
40
5,000
10,000
10,000
40,000
10-W(*)
20-W
(**)
S. A . E.
20
S. A . E.
30
S. A . E.
40
5,000
10,000
10,000
40,000
120
185
255
185
255
10-W(*)
20-W
(**)
S. A . E.
20
S. A . E.
30
S. A . E.
40
120
185
255
185
255
10-W(*)
20-W
(**)
S. A . E.
20
S. A . E.
30
S. A . E.
40
120
185
255
185
255
75
10-W(*)
20-W
(**)
S. A . E.
20
S. A . E.
30
S. A . E.
40
120
185
255
75
*Sub-zero pour point. " Z e r o pour point.
Plate 70. Engine Oil Recommendations