GMC 1993 Suburban Owner's Manual page 276

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K2613
To Check Engine Oil: Pull out the dipstick and clean it with a paper towel
or cloth, then push it back in all the way. Remove
it
again, keeping the tip
lower.
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. This part explains what
kind of oil to use. For crankcase capacity, see "Capacities and Specifications"
in the Index.
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