1995 GMC Yukon Owner's Manual - Page 303

To Check Engine Oil Pull out the dipstick and clean i t with a paper towel or a cloth, then push i t back in a l l the way. Remove it again. keeping the tip down. When to Add Oil If the oil is a t o r below the ADD line. then you'll need t o add some oil. Rut you must use the right kind. This part explains what kind of oil t o use. For crankcase capacity, see "Capacities and Specifications" i n the Index. NOTICE: Don't add too muchoil. If your engine has so much oil that the oil level gets above the proper operating range, your engine could be damaged. 6-2 I