2003 GMC Savana Van Owner's Manual - Page 259

What Kind of Engine 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. If you choose to perform the engine oil change service yourself, be sure the oil you use 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 your engine is American Petroleum Institute certified for gasoline engines. RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS HOT WEATHER "F + 100 t "C + 38 t 21 t 16 an + 60 t 40 +4 t 20 0 -7 - 18 1-1 ACCEPTABLE IF 5W-30 IS NOT AVAILABLE SAE 5W-30 RECOMMENDED I-I , I - LOOK FOR THIS SYMBOL SAE 1 OW-30 You should also use the proper viscosity oil for your vehicle, as shown in the viscosity chart. C LD WEATHER DO NOT USE SAE 1OW-40, 20W-50 OR ANY OTHER SAE VISCOSITY GRADE OIL NOT RECOMMENDED 5-16