1997 Buick Riviera Owner's Manual - Page 252

Engine Oil Additives Don't add anythingto your oil. Your Buick dealer is ready to adviseif you think something should be added. When to Change Engine Oil If any one of these is true for you, usethe short trip/city maintenance schedule: a Most trips are less than5 to 10 miles (8 to 16 km). If none of them is true, use the long tripkghway maintenance schedule. Change the oil and every filter 7,500 miles (12500 k ) 12 months -- whichever m or a fully warmed occurs first. Driving a vehicle with engine under highway conditions causes engine to oil break down slower. What to Do with Used Oil Did you know that used engineoil contains certain elements that may be unhealthy your skin and could for skin even cause cancer? Don'tlet used oil stay on your for very long. Clean your and nails with soap and skin water, or a good hand cleaner. Wash or properly throw away clothing or rags containing used engine oil. (See the manufacturer's warnings about use and disposal the of oil products.) Used oil can be a threat to the environment. you real If change your own be sure to drain all free-flowing oil oil, from the filter before disposal. Don't ever dispose oil of it by puttingit in the trash, pouring on the ground, into sewers, orinto streams or bodies of water. Instead, If recycle it by taking it to a place that collects used oil. you have a problem properly disposing your usedoil, of ask your dealer, a service station or a local recycling center for help. This is particularly important when outside temperatures are below freezing. a Most tripsinclude extensive idling (such as frequent driving in stop-and-go traffic). a Most trips are through dusty areas. a You frequently tow a trailer or use a carrier on top of your vehicle. a The vehicle is used for delivery service, police, taxi or other commercial application. Driving under these conditions causes engine to oil break down sooner.If any one of these is true for your vehicle, then you need to change yourand filter oil every 3,000 miles (5 000 km) or 3 months -- whichever occurs first. 6-15