Chevrolet 2011 Express 1500 Cargo Owner's Manual page 281

It is possible that, if driving under
the best conditions, the oil life
system might indicate that an oil
change is not necessary for up
to a year. The engine oil and filter
must be changed at least once a
year and, at this time, the system
must be reset. Your dealer has
trained service people who will
perform this work and reset the
system. It is also important to check
the oil regularly over the course of
an oil drain interval and keep it at
the proper level.
If the system is ever reset
accidentally, the oil must be
changed at 5 000 km (3,000 mi)
since the last oil change.
Remember to reset the oil life
system whenever the oil
is changed.
Reset the system whenever the
engine oil is changed so that the
system can calculate the next
engine oil change. To reset the
system:
1. Turn the ignition key to ON/RUN
with the engine off.
2. Fully press and release the
accelerator pedal slowly three
times within five seconds.
3. Turn the key to LOCK/OFF.
If the CHANGE ENGINE OIL SOON
message comes back on when the
vehicle is started, the engine oil life
system has not reset. Repeat the
procedure.
If the vehicle has a diesel engine,
see the Duramax diesel supplement
for more information.
A good time to check the automatic
transmission fluid level is when the
engine oil is changed.
Change the fluid and filter at the
intervals listed in
sure to use the transmission fluid
listed in
and be
.