Saturn 2007 Ion Owner's Manual page 284

When to Add Engine Oil
If the oil is below the MIN (minimum) mark, you
need to add at least one quart/liter of oil. But you
must use the right kind. This section explains
what kind of oil to use. For engine oil crankcase
capacity, see Capacities and Specifications
on page 384.
Notice: Do not add too much oil. If the engine
has so much oil that the oil level gets above
the upper mark that shows the proper
operating range, the engine could be damaged.
284
2.2L L4 Engine and
2.4L L4 Engine
See Engine Compartment Overview on page 280
for the location of the engine oil fill cap.
Be sure to add enough oil to put the level
somewhere in the proper operating range.
Push the dipstick all the way back in when you
are through.
2.0L L4 Supercharged
Engine