1996 GMC Savana Van Owner's Manual - Page 236

What Kind of Oil to Use Oils recommended for your vehicle can be identified by looking for the "Starburst" symbol. This symbol indicates that the oil has been certified by the American Petroleum Institute (API). Do not use any oil which does not carry this Starburst symbol. The engineoil filler cap is located between the air cleaner and engine oil dipstick. 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. If you change your own oil, be sure you use oil that has the Starburst symbol on the front of the oil container. If you have your oil changed for you, be sure the oil put into yourengine is American Petroleum Institute certified for gasoline engines. You should also use the proper viscosity oil for your vehicle, as shown in the following chart: 6-12