Chevrolet Light - Page 74

Lubrication-First 500 Miles. The crankcase of the engine, as
delivered, is filled wi th a light body breaking-in oil.
Use this oil during the first 500 miles.
NOTE: At the end of the first 500 miles, drain the. cran k case-
when .hot- and refill to the proper level w ith the r«om mend ed oil.
Lubrication-After 500 Miles. After the first 500 miles, the
crankcase oil should be se lected to give the best performance
under individual climatic and driving conditions.
Fa ll-Wint er-Sp ring. During the colder months of the year,
an oil which will permit easy starting at the lowest atmospheric
temperature likely to be encountered should be used.
When the crankcase is drained and ·refilled, the crankcase
oil should be selected not on the ba sis of the existing tempera-
ture at the time of the change, but on the lowest temp erature
anticipated for the period during which the oil is to be u se d.
Unless the crankcase oil is se lected on the ba sis of viscosity
or fluidity at the anticipated temperature, difficulty in starting
will be experienced at each sudden drop in temperature.
The viscosity grade of crankcase oil will, therefore, depend
upon the climatic conditions under which a truck is oper-
ated . The grades best suited for use in the engine at the
various temperatures are shown in the following table:
II you anticipate t hat the
low es t atmosp he r ic tem{)er-
atu re will be:
As l ow as 32· •• F.
As low as plus 10· F.
As low
as minus 10 · F.
Below mi
nus 10 ' F.
• 72 '
Use the grade indicated:·
S.A.E. 20-W or S. A.E. 20
S.A.E.20-W
S.A.E.IO-W
S.A.E. 10-W plus 10 % Kerosene