2001 GMC Yukon Owner's Manual - Page 318

When to Add Engine Oil If the oil is at or below the ADD mark, then you'll need to add at least one quart of oil. But you must use the right kind. This part explains what kind of oil to use. For crankcase capacity, see "Capacities and Specifications" in the Index. All Other Engines 8100 Engines The engine oil fill cap for the VORTEC 4800, 5300, 6000 and 8100 V8 engines is located on the passenger's side engine valve cover. See "Engine Compartment Overview" in the Index for more information on location. Be sure to fill it enough to put the level somewhere in the proper operating range. Push the dipstick all the way back in when you're through. NOTICE: Don't add too much oil. If your engine has so much oil that the oil level gets above the cross-hatched area that shows the proper operating range, your engine could be damaged. 6-15