Starting And Operating Your Vehicle; New Vehicle Break-In - GMC 2010 Yukon XL Denali Owner's Manual

Starting and Operating Your
Vehicle

New Vehicle Break-In

Notice: The vehicle does not need an elaborate
break-in. But it will perform better in the long run if
you follow these guidelines:
Keep your speed at 55 mph (88 km/h) or less
for the first 500 miles (805 km).
Do not drive at any one constant speed,
fast or slow, for the first 500 miles
(805 km). Do not make full-throttle starts.
Avoid downshifting to brake or slow the
vehicle.
3-24
Avoid making hard stops for the first
200 miles (322 km) or so. During this time
the 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.
Do not tow a trailer during break-in.
See Towing a Trailer on page 5 42 for the
trailer towing capabilities of the vehicle and
more information.
Following break in, engine speed and load can be
gradually increased.