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CHAPTER nI
LUBRICATION
Your Chevrolet dealer is equipped to render complete
lubrication service. We recommend that you take advantage
of his modern equipment and trained men.
Lubricants are much cheaper than repair bills, and should
be applied regularly if you are to secure a maximum of useful
service from your truck. It is consequently, important that the
proper grade of lubricants be used in accordance with a defi-
nite schedule.
In your selection of the proper brand of oil, it is desirable
to consider the reputation of the refiner or marketer. He is
responsible for the quality of his'product and his reputation is
the truck owner's best indication of quality.
ENGINE
Your use of the proper engine oil is one of great importance
in obtaining maximum performance and satisfaction from
your truck.
It is imperative that the recommended light oils be used in
the engine during the "breaking-in" period.
Light oils assist in better "breaking-in" of the engine, as
they assure ease of starting; prompt flow of a sufficient quan-
tity of oil to the bearings; less friction between moving parts;
less wear of moving parts, etc.
Types of Oil-In service, crankcase oils may form sludge and
varnish and under some conditions corrosive acids unless pro-
tected against oxidation. To minimize the formation of these
harmful products"and to supply the type of oil best suited for
various operating conditions, the oil industry markets several
types of crankcase oils. These types have been defined by the
American Petroleum Institute as follows:
"Service ML" (Comparable to former Regular Type)-Gen-
erally suitable for use in internal combustion engines operat-
ing under light and favorable service conditions.
"Service MM" (Comparable to former Premium Type)-
Oil having the characteristics necessary to make it generally
suitable for use in internal combustion engines operating under
moderate to severe service conditions which present problems
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