Chevrolet 4500 HD 2023 Manual page 319

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318
Service and Maintenance
Remarks
(1) In case this column is blank, follow
kilometers (miles).
(2) Use of oils other than CK-4 may require
shorter maintenance intervals and may
cause nonconformity to regulations. (CJ-4
can be used while it is available.) Use of oils
with other viscosity than *W-40 may also
require shorter maintenance intervals and
may cause a problem with engine durability.
(3) Refer to "Air Cleaner Indicator Light"
under Engine Air Cleaner/Filter 0 249.
(4) Initial check at 8 000 km (5,000 miles) is
required.
(5) Be sure to discard used grease seal, and
always use new grease seal for installation.
Explanation of Complete Vehicle
Maintenance Schedule
The following is a brief explanation of each
of the services listed in the preceding
Complete Vehicle Maintenance Schedule.
Normal Vehicle Use
The vehicle maintenance instructions in the
Maintenance Schedule are based on the
assumption that the vehicle will be used as
designed:
to carry passengers and cargo within the
limitations specified on the vehicle VIN
and GVW plate.
on reasonable road surfaces within legal
operating limits.
on a daily basis, as a general rule, for at
least several miles/kilometers.
Unusual operating conditions will require
more frequent vehicle maintenance, as
specified in the following section.
1. Engine Noise Check : These components
have an effect on the control of noise
emissions.

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