1997 Buick Park Avenue Owner's Manual - Page 280

Engine Oil Additives Don't add anything to your oil. Your Buick dealer is ready to advise if you think something shouldbe added. When to Change EngineOil If any one of these is true for you, use the short tripkity maintenance schedule: e Most trips are less than 5 to 10 miles (8 to 16 km). Driving under these conditions causes engine oil to break down sooner.I any one of these is true for your vehicle, f oil then you need to change your and filter every 3,000 miles (5 000 k ) 3 months -- whichever occurs m or first. (See "Change Engine Oil Soon" the Index.) in If none of them is true, the long triphighway use maintenance schedule. Change the oil and filter every 7,500 miles (12 500 km) or 12 months -- whichever occurs first. Driving a vehicle with a fully warmed engine under highway conditions causes engine oil to break down slower. If the optionalCHANGE ENGINE OIL SOON message comes on, you will needto change your oil sooner than either mileage specified. Depending upon driving habits, the CHANGE ENGINE OIL SOON message may come on as early as 2,000 miles or less from the last time the oil life index was reset.(See "Oil Life Index" in the Index.) Always reset the o l life monitor after every i oil change. This is particularly important when outside temperatures are below freezing. e Most trips include extensive idling (such asfrequent driving in stop-and-go traffic). 0 Most trips are through dusty areas. You frequently tow a trailer use a carrier on top of or your vehicle. The vehicle is used for delivery service, police, taxi or other commercial application. 0 0 6-16