2000 GMC Sierra 1500 Pickup Owner's Manual - Page 316

yellowblue The engine oil fill cap for the VORTEC 4300 V6 engine is located on the driver's side engine valve cover. 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. The engine oil fill cap for the VORTEC 4800, 5300 and 6000 V8 engines is located on the passenger's side engine valve cover. 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. 6-13