1995 GMC Yukon Owner's Manual - Page 297

A' Turn off the engine and give the oil a few minutes to drain back into the oil pan. If you don't, the oil dipstick might not show the actual level. To Check Engine Oil Pull out the dipstick and clean it with a papertowel or cloth, then push it back in all the way. Remove it again,keeping the tip down. When to Add Oil If the oil is at or below the ADD mark, then you'll need to add some oil.But you must use the right kind. Thispart explains what kind of oil to use. For crankcase capacity, see "Capacitiesand Specifications" in the Index. NOTICE: Don't addtoo much oil. If your enginehas so much oil that the oil level getsabove the upper mark that shows the proper operating range, your engine could damaged. be 6-15