1996 GMC Sonoma Owner's Manual - Page 233

NOTICE: Don't add too much If your enginehas so oil. much oil that the oil level gets above the shows the proper cross-hatched area that operating range, your engine could be damaged. Just 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. When to Add Oil If the oil is at or below the ADD line, then you'll need to add some oil. But you must use the right kind. This part explains what kindof oil to use.For crankcase capacity, see "Capacities and Specifications'' inthe Index. 6-11