1998 Buick Regal Owner's Manual - Page 280

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°F (16 O C) before your next oil change. When it's very cold, 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. Engine Oil Additives Don't add anything to your oil. Your dealer is ready to advise if you think something should be added. When to Change Engine Oil Your vehicle has an Oil LifeMonitor. This feature will let you know when to change your oil and filter -- usually between 3,000 miles (5 000 k ) m and 7,500 miles (12 500 km) since your last oil change. Under severe conditions, the indicator may come on before 3,000 miles (5 000 km). Never drive your vehicle more than 7,500 miles (12 500 k ) 12 months m or (whichever occurs first) without an oil change. NOTICE: Use only engine oil with the American Petroleum Institute Certified For Gasoline Engines "Starburst" symbol. Failure to use the recommended oil can result in engine damage not The system won't detect dustin the oil. So, if you drive in a dusty area, be sure to change your oil every covered by your warranty. 3,000 miles ( 5 000 km) or sooner. Remember to reset the CHANGE OIL SOON light when the oil has been GM Goodwrench@oil meets all the requirements for changed. For more information, see "Change Oil Soon your vehicle. Light" in the Index. If you are in an area where the temperature falls below How to Reset theCHANGE OIL SOON Light -20°F (-29"C),consider using either an SAE 5W-30 After changing the engine oil, the system must be reset. synthetic oil or an SAE OW-30 oil. Both will provide With the ignition key in RUN but the engine off, fully easier cold starting better protection for your engine and push and release the accelerator pedal slowly three times at extremely low temperatures. within five seconds. If the CHANGE OIL SOON light flashes, the system is resetting. Turn the key to OFF, 6-16