Pontiac 2003 Bonneville Owner's Manual page 275

Checking Engine Oil
It's a good idea to check your engine
oil
every time you
get fuel. In order to get an accurate reading, the oil
must be warm and the vehicle must be on level ground.
Turn off the engine and give the oil several minutes to
drain back into the oil pan. If you don't, the oil
dipstick might not show the actual level.
Pull out the dipstick and clean it with a paper towel or
cloth, then push
it
back in all the way. Remove it again,
keeping the tip down, and check the level.
The engine oil dipstick is located behind the engine
cooling fans and in front of the engine
oil
fill cap. The top
of the dipstick is a round yellow loop. See Engine
Comparfment Overview on page 5-74 for more
information on location.
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