2008 GMC Envoy Owner's Manual - Page 311

If the oil is below the L mark for the L6 engine or the cross-hatched area at the tip of the dipstick for the V8 engine, 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 5-120. Notice: Do not add too much oil. If the engine has so much oil that the oil level gets above the cross-hatched area (F) that shows the proper operating range for the L6 engine or above the cross-hatched area for the V8 engine, the engine could be damaged. See Engine Compartment Overview on page 5-12 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. 5-17