Starting And Operating Your Vehicle; Ignition Positions; New Vehicle Break-In - GMC 2005 T-Series Owner's Manual

Starting and Operating Your
Vehicle

New Vehicle Break-In

Notice: Your vehicle does not need an elaborate
break-in. But it will perform better in the long run if
you follow these guidelines:
•
Let your engine warm up before you operate
your vehicle under load.
•
Keep your speed at 55 mph (88 km/h) or less for
the first 500 miles (805 km).
•
Do not drive at any one speed — fast or
slow — for the first 500 miles (805 km). Do
not make full-throttle starts.
•
Avoid making hard stops for the first 200 miles
(322 km) or so. During this time your new brake
linings are not yet broken in. Hard stops with new
linings can mean premature wear and earlier
replacement. Follow this breaking-in guideline
every time you get new brake linings.
•
Use the lowest gear you can when you start a
loaded vehicle in motion and when going up hills
to avoid overloading the engine.
•
Check and adjust engine and transmission fluid
levels often and be sure tires are properly
inflated for the load you are carrying.

Ignition Positions

LOCK: This position allows you to insert and remove
the ignition key.
ACC (Accessory): This position lets you use
accessories when the engine is off.
ON: This is the position for driving.
START: This position starts your engine.
Use your ignition key to
start your vehicle. You can
turn the ignition switch
to four different positions.
2-7