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Crankcase Oil Classification
Viscosity
Viscosity (Saybolt Universal)
Number
0
0
F.
130
0
F.
Min.
Max.
Min.
Max.
1O-W(*) ..............
5,000
10,000
..
.
.
.
.
20-W(**)
....
..
.
.
...
..
10,000
40,000
..
.
.
,
.
S.A.E. 20
,
.
..
.
....
.
...
...
..
.
..
....
120
185
S.A.E.
30
....
.
..
..
.
.
..
......
.
.
.
.
.
.
185
255
·Sub-zero pour test.
• ·Zero pour test.
The oils with the lower S.A.E. numbers are lighter and flow
more readily than do the .oils with the high numbers.
Lubrication-First 500 Miles -
The crankcase of the engine, as delivered to you, is filled
with
10-W oil. Use this oil during the first 500 miles.
At the end
of
the first 500 miles, drain the crankcase-when
hot-and refill to the proper level
with
the recommended
oil.
Lubrication-After 500 Miles-
After
the
first 500 miles the crankcase
oil
should
be
selected to
give the best performance under
your
individual climatic
and
driving conditions.
Fall - Winter - Spring -
During
the coldermon ths of the
year
an
oil
which
will
permit easy starting at the lowest atmos-
pheric temperature likely to be encountered
should be used. When the crankcase is drained
and refilled, the crankcase
oil
should be se-
lected not on the basis of the
existing
tem-
perature at the time of the change, but on the
Fig.41-Lowest
Easy Starting
Temperature
fifty
"lowest temperature anticipated
for
the period
during which the oil is to be used.
Unless the crankcase oil is selected on the
basis of viscosity or fluidity at the lowest an-
cipated temperature, difficulty in starting will
be experienced at each sudden drop in tem-
perature.
The viscosity grade of crankcase oil will,
therefore, depend upon the climatic condi-
tions under which your car is operated. The
grades best suited for use in
your
engine at
the various temperatures are shown in the
tables on the next page.
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