GMC 1995 Suburban 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 much oil. If your engine has so much oil that the
oil level gets above the proper operating range, your engine
could be damaged.
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