1995 Buick Regal Owner's Manual - Page 220

NOTICE: Use only engine oil with the American Petroleum Institute Certified For Gasoline Engines "Starburst" symbol. Failure to use the proper oil by can result in engine damage not covered your warranty. When to Change Engine Oil See if any one of these is true for you: 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 dusty areas. You frequently tow a trailer or use a carrier on top of your vehicle. GM Goodwrench@oil (in Canada, GM Engine Oil) meets all the requirements for your vehicle. Engine Oil Additives Don't add anything to your oil. Your Buick dealer is ready to advise if you think something should be added. Tf any one of these is true for your vehicle, then you need to change your oil and filter every 3,000 miles ( 5 000 km) or 3 months -- whichever comes first. If none of them is true, change the oil and filter every 7,500 miles (12 500 km) or 12 months -- whichever comes first. 6-12