Buick 2009 Lucerne - Manual (Page 302)

When to Add Engine Oil If the oil is below the cross-hatched area at the tip
of the dipstick, add at least one quart/liter of the
recommended oil. This section explains what kind
of oil to use. For engine oil crankcase capacity,
see Capacities and Specifications on page 5-106.
Notice: Do not add too much oil. If the engine
has so much oil that the oil level gets above the
cross-hatched area that shows the proper operating
range, the engine could be damaged.
See Engine Compartment
Overview on page 5-14
for the location of the
engine oil fill cap.
Add enough oil to put the level somewhere in the proper
operating range in the cross-hatched area. Push the
dipstick all the way back in when through.
3.9L V6 Engine
4.6L V8 Engine
5-18