2003 Buick Rendezvous Owner's Manual - Page 327

RECOMMENDED SAE VISCOSITY GRADE ENGINE OILS HOT WEATHER - LOOK FOR T I HS SYMBOL 7 'OF "C As in the chart shown previously, SAE 5W-30 is the only viscosity grade recommended for your vehicle. You should look for and use only oils which have the API Starburst symbol and which are also identified as SAE 5W-30. If you cannot find such SAE 5W-30 oils, you can use an SAE IOW-30 oil which has the API Starburst symbol, if it's going to be 0°F (-18°C) or above. Do not use other viscosity grade oils, such as SAE 1OW-40 or SAE 20W-50 under any conditions. Notice: Use only engine oil with the American Petroleum Institute Certified For Gasoline Engines starburst symbol. Failure to use the recommended oil can result in engine damage not covered by your warranty. GM Goodwrench@oil meets all the requirements for your vehicle. + l o o - - . t38 + 8 0 - -- + 2 7 +60-- + 16 +40-- - t 4 + 2 0 - -- - I O-- - 18 I IF 5W-30 IS NOT -30 AVAILABLE RECOMMENDED v .I 1 1 1 ACCEPTABLE 1OW-30 SAE \ I COLD WEATHER DO NOT USE SAE iOW-40, SAE 20W-50 OR ANY OTHER VISCOSITY GRADEOIL NOT RECOMMENDED If you are in an area of extreme cold, where the temperature falls below -20°F (-29"C), it is recommended that you use either an SAE 5W-30 synthetic oil or an SAE OW-30 oil. Both will provide easier cold starting and better protection for your engine at extremely low temperatures. Engine Oil Additives Don't add anything to your oil. The recommended oils with the starburst symbol are all you will need for good performance and engine protection. 5-16