Oil System 67
Oil Viscosity
The viscosity grade defines the thickness of
the oil. The oil must be thin enough at low
temperatures for easy cold starts and thick
enough to protect at high temperatures. An
oil is not fully defined until both the API
quality classification a
nd the viscosity
grade are specified.
Choose the viscosity grade for the typical
ambient temperature for the application.
Multigrade oils have a broad range that suit
operation in changing temperature. Only
choose a monograde oil if the temperature
is holding steady over a long period of time
Volvo Trucks North America, Inc. recom-
mends the viscosities shown in the
viscosity/temperature table for Volvo en-
gines. See page 167 for vendor engines.
Choosing an oil with a lower viscosity can
help improve the fuel economy. However, if
this is done, make sure the upper tempera-
ture limit is not exceeded. Also, with low
viscosity oil, oil consumption can increase.
CAUTION
Extra oil additives must not under any
circumstances be added to any engine
oil used. Additives such as break-in oils,
top oils, graphitizers and friction reduc-
ing liquids are not necessary and may
even harm the engine.
W1000144
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