1996 Buick Riviera Owner's Manual - Page 244

As shown in the-chart,SAE 1OW-30 is best for your vehicle. However, you can use-'SAE 5W-30 if it's going to b e colder than60°F (16°C) before your next oil change. When it's very cold, you should use. S A E 5W-30. These numbers on an container oil Do show its viscosity, or thickness. not use other viscosity oils, such as SAE 2OW-50. When to Change Engine Oil See if any oneof these is true for you: 0 Most trips are less than 5 to 10 miles (8 to 16 km). This is particularly Important when outside temperatures are below freezing. Most trips include extensive idling (such as frequent driving in stop-and-go traffic). Most trips are through dustyaxeas. You 'frequently towa trailer or us your vehicle. - 0 NOTICE: Use only engine oil with the American Petroleum Institute CertifiedFor Gasoline ,Engines 4CStarburst" symbol. Failure to use the reco,mrnendedoil can result in engine -damage not covered by your warranty. \ 0 0 '1 carrier on top of a The vehicleis used for delivery service, police, taxi or other commercial application. Driving under these conditions causes engine oil to break down sooner. If any one these is true foryour of vehicle, then you need to change your and filter oil every 3,000 miles (5 000 k ) 3 months -- whichever m or occurs. first. GM Goodwrench@ meets all the requirements for oil your vehicle. Engine Oil Additives Don't add anythingto your oil. Your Buick dealer is ready to advise if you thinksomething should be added. If none of them is true, change the and filter every oil 7,500 miles (12 500 lun) or 12 months - whichever a occurs first. Driving vehicle witha fully warmed ol i engine under highway conditions causes engine to break down slower.