GMC 2012 Savana Owner's Manual page 268

When the correct fluid level is
obtained, push the dipstick back
in all the way; then flip the
handle down to lock the dipstick
in place.
The engine air cleaner/filter is
located near the center of the
engine compartment. See
for more information on
location.
Inspect the air cleaner/filter at the
scheduled maintenance intervals
and replace it at the first oil change
after each 80 000 km (50,000 mi)
interval. See
for more information.
If driving in dusty/dirty conditions,
inspect the filter at each engine oil
change.
To inspect the air cleaner/filter,
remove the filter from the vehicle
and lightly shake the filter to release
loose dust and dirt. If the filter
remains covered with dirt, a new
filter is required. Never use
compressed air to clean the filter.
To inspect or replace the engine air
cleaner/filter, do the following:
1. Unhook the retainer clips and
remove the cover.
2. Lift the filter out of the engine
air cleaner/filter housing. Care
should be taken to dislodge as
little dirt as possible.
3. Clean the engine air cleaner/
filter housing.
4. Inspect or replace the engine
air cleaner/filter. Make sure that
the filter fits properly into the
housing.
5. Reinstall the cover and fasten
the retaining clips.