Chevrolet 2008 T Series Owner's Manual page 68

Extended idling can cause exhaust parts and gases to
become very hot. Keep the exhaust area clear of
material that could ignite or burn. See Parking Over
Things That Burn on page 2-27 for more information.
For vehicles with Power Take-Off (PTO), monitor
the instrument panel cluster for lights related to the DPF.
All engines consume some amount of engine oil. This
is normal. The by-product of combustion of engine oil is
ash. The ash will become trapped in the DPF over
the life of the vehicle. Eventually, the buildup of ash will
restrict the exhaust gases and the DPF will need to
be cleaned or replaced.
See Accessories and Modifications on page 5-3 for
important information.
2-30
Manual Regeneration Procedure
CAUTION:
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During DPF regeneration, the exhaust system
and exhaust gases are very hot. Stay clear of
the tailpipe area and do not park over things
that burn. You or others could be burned or
your vehicle could catch fire. See Parking Over
Things That Burn on page 2-27.
If the yellow or red DPF indicator is on, you can clean
the DPF by performing a manual regeneration.