Chevrolet Low Cab Forward 4500 2019 Series Owner's Manual page 272

Severe Driving Conditions
A vehicle operated under severe
conditions (see list below) requires
more frequent maintenance.
Frequent short trips of less than
6 kilometers (4 miles) in
moderate temperatures
Frequent short trips of less than
16 kilometers (10 miles) in sub-
freezing temperatures
Frequent and extended low-
speed engine operation (door-
to- door deliveries, stop- and- go
traffic, etc.)
Driving on unpaved roads with
heavy dust
Towing a trailer
Preventive Maintenance
As any mechanical device operates,
a certain amount of wear occurs.
The amount of wear depends on
certain variables type and method
of operation and the schedule of
maintenance. These variables may
be emphasized as critical to
malfunction but each is dependent
upon the other. For example, if a
vehicle is repeatedly overloaded,
driven at excessive speed or
improperly shifted, no schedule of
maintenance can prevent
malfunction. Also, if a preventive
maintenance schedule is not
followed, or is improperly carried
out, no amount of correct vehicle
operation will prevent malfunction.
Service and Maintenance
If vehicle application, operation and
preventive maintenance schedules
and procedures are followed and
properly carried out, the life of the
vehicle will be greatly extended.
For example, regular attention to the
engine oil is essential. The oil level
must be periodically checked and oil
added whenever needed. Also, the
oil should be changed at the
intervals specified with the proper
quality and viscosity of oil. If your
engine should run excessively low
on oil or if the oil has lost its
lubricating qualities because of old
age, serious engine damage could
occur.
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