Chevrolet GMC Duramax 2023 Manual page 62

Warning
Performing maintenance work can be
dangerous and can cause serious injury.
Perform maintenance work only if the
required information, proper tools, and
equipment are available. If they are not,
see your dealer to have a trained
technician do the work. See Doing Your
Own Service Work in the owner s
manual.
Maintenance Schedule
See the owner s manual for other services
and intervals that may be required.
Power Take Off (PTO) and Extended
Idle Use
When the vehicle is used with the PTO
equipment or used in a way that requires
extended idle time, one hour of use shall be
deemed the same as 53 km (33 mi). See
Driver Information Center (DIC) for
hourmeter, if equipped.
Additional Required Services
Every 12 000 km (7,500 mi)
Check engine oil level and oil
life percentage. If needed, change engine
oil and filter, and reset oil life system. Or
when the CHANGE ENGINE OIL SOON
message displays, have the engine oil
and filter changed within the next
1 000 km/600 mi. If driven under the best
conditions, the engine oil life system may
not indicate the need for vehicle service
for up to a year. The engine oil and filter
must be changed at least once a year and
the oil life system must be reset. Your
trained dealer technician can perform this
work. If the engine oil life system is reset
accidentally, service the vehicle within
5 000 km/3,000 mi since the last service.
Reset the oil life system when the oil is
changed. See Engine Oil Life System 0 49.
When the REPLACE AT NEXT OIL CHANGE
message displays, the engine air filter
should be replaced at the next engine oil
change. When the REPLACE ENGINE AIR
FILTER SOON message displays, the
engine air filter should be replaced at the
earliest convenience. Reset the engine air
Service and Maintenance
filter life system after the engine air filter
is replaced. See Engine Air Filter Life
System 0 49.
Every 36 000 km (22,500 mi)
Replace fuel filter. Or every two years,
or when the CHANGE FUEL FILTER
message in the Driver Information Center
(DIC) comes on, whichever comes first.
The fuel filter may need to be replaced
more often based on biodiesel usage,
when driving in climates with excessive
dust, or when off-road driving or towing a
trailer for extended periods.
Every 240 000 km (150,000 mi)
Drain and fill engine cooling system. Or
every six years, whichever comes first.
See Cooling System (Engine) 0 52 or
Cooling System (Low Temperature Cooling
Circuit) 0 54.
Owner Checks and Services
Check the DEF percentage at each fuel stop.
See Diesel Exhaust Fluid 0 19.
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