1995 Buick Riviera Owner's Manual - Page 224

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 be colder than 60 O F (16 C) before your next oil change. When it's verycold, you should use SAE 5W-30. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils, such as SAE 20W-50. O When to Change Engine Oil See if any one of these istrue for you: Most trips are less than 5 to 10 miles (8 to 16 k ) m. This is particularly important when outside temperatures are below freezing. 0 Most trips include extensive idling (such as frequent driving in stop and go traffic). Most trips are through dusty areas. NOTICE: Use only engine oil with the American Petroleum You frequently tow a trailer or use a carrier on top of your vehicle. Institute Certified For Gasoline Engines "Starburst" symbol. Failure to use the proper oil If any one of these is true for your vehicle, then you can result in engine damage not covered by your need to change your oil and filter every 3,000 miles warranty. ( 5 000 k ) 3 months -- whichever comes first. m or GM Goodwrench@oil (in Canada, GM Engine Oil) meets all the requirements for your vehicle. If none of them is true, change the oil and filter every 7,500 miles (12 500 k ) 12months -- whichever m or comes first. Engine Oil Additives Don't add anything to your oil. Your Buick dealer is ready to advise if you think something should be added. Engine Coolant Heater (Option) An engine coolant heater can be a big help if you have to park outside in very cold weather, 0°F (- 18 "C) or colder. If your vehicle has this option, see "Engine Coolant Heater" in the Index. 6-15