1998 GMC Safari Owner's Manual - Page 274

When to Add Engine Oil If the oil is at or below theADD line, then you'll need to add at least one quart of oil. But you must use the right kind. This part explains what kindoil to use. For of crankcase capacity,see "Capacities and Specifications" in the Index. What Kind of Engine Oilto Use Oils recommendedfor your vehicle can be identified by looking for the "Starburst" symbol.This symbol indicates that the has been certified by the American oil Petroleum Institute (API).Do not use anyoil which does not carry this Starburst symbol. If you change your own oil, be sure you use that has oil' the Starburst symbol on the front of the oil container. If you have your changed oil for you, be sure the put oil into your engine is American Petroleum Institute certifiedfor pasoline enpines. You should also use the proper viscosity oil your for vehicle, as shown in the following chart: I NOTICE: Don't add too much oil. your engine has If so much oil that the oil level gets above the cross-hatched area that shows the proper operating range, your engine could be damaged. Be sure tofill it enough to put level somewherein the the proper operating range. Push the dipstick all the way back in when you're through. 6-12