2003 GMC SIERRA oil capacities

When to Add Engine Oil
If the oil is at or below the cross-hatched area at the dip
of the dipstick, then you’ll need to add at least one
quart of oil. But you must use the right kind. This part
explains what kind of oil to use. For engine oil crankcase
capacity, seeCapacities and Specifications on
page 5-99.
Notice:Don’t add too much oil. If your engine has
so much oil that the oil level gets above the
cross-hatched area that shows the proper operating
range, your engine could be damaged.The engine oilfill cap is
located on the passenger’s
side valve cover.
SeeEngine Compartment Overview on page 5-12for
more information on location.
Be sure tofill it enough to put the level somewhere in
the proper operating range. Push the dipstick all the way
back in when you’re through.
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2003 - Sierra Denali

Coolant Surge Tank Pressure Cap
The coolant surge tank
pressure cap must be fully
installed on the coolant
surge tank.
Notice:Your pressure cap is a pressure-type cap
and must be tightly installed to prevent coolant loss
and possible engine damage from overheating.
See“Capacities and Specifications”for more
information.
Engine Overheating
You willfind a coolant temperature gage on your
vehicle’s instrument panel. SeeEngine Coolant
Temperature Gage on page 3-36. In addition, you will
find a LOW COOLANT, ENGINE OVERHEATED and a
REDUCED ENGINE POWER message in the DIC on
the instrument panel. SeeDriver Information Center
(DIC) on page 3-42.
Overheated Engine Protection
Operating Mode
If an overheated engine condition exists and the
REDUCED ENGINE POWER message is displayed, an
overheat protection mode which alternatesfiring
groups of cylinders helps prevent engine damage. In
this mode, you will notice a loss in power and engine
performance. This operating mode allows your vehicle to
be driven to a safe place in an emergency. Driving
extended miles (km) and/or towing a trailer in the
overheat protection mode should be avoided.
Notice:After driving in the overheated engine
protection operating mode, to avoid engine damage,
allow the engine to cool before attempting any repair.
The engine oil will be severely degraded. Repair the
cause of coolant loss, change the oil and reset the oil
life system. See“Engine Oil”in the Index.
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2003 - Sierra Denali

Fuses Usage
FOG LP Fog Lamp Relay
FOG LP Fog Lamps
HORN Horn Relay
W/S WASHWindshield Washer Pump
Relay
W/S WASH Windshield Washer Pump
INFOOnStar/Rear Seat
EntertainmentFuses Usage
RADIO AMP Radio Amplifier
RH HID Not Used
HORN Horn
EAP Not Used
TREC All-Wheel Drive Module
SBA Supplemental Brake Assist
Capacities and Specifications
Capacities and Specifications
ApplicationCapacities
English Metric
Cooling System 14.8 quarts 14.0 L
Engine Oil with Filter 6.0 quarts 5.7 L
Fuel Tank 26.0 gallons 98.4 L
Air Conditioning Refrigerant R134a 1.6 lbs. 0.7 kg
Use Refrigerant Oil, R134a Systems
All capacities are approximate. When adding, be sure tofill to the approximate level, as recommended in this
manual. SeePart D: Recommended Fluids and Lubricants on page 6-15.
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2003 - Sierra Denali