1993 Oldsmobile 88 Owner's Manual - Page 232

Engine Oil Additives Don't add anythmgto your oil. Your Oldsmobile dealer is ready to advise if you think something should be added. When to Change Engine Oil If none of themis true, change the oil See if any one of these istrue for you: Most tripsare less than4 miles (6 h). every 7,500 miles (12500 km) or 12 months-whichever comes first. Change It's below freezing outside and most the filter at the first oil change and at trips are less than 1 miles (16 h). every other oil change after that.If your 0 The engine is at low speed most the vehicle is equipped with the Driver of time (as in door-to-door delivery,or in Information Center, always reset the Stop-and-go traffic). engine oil life to 100%after every oil change. You tow a trailer often. Engine Block Heater Most trips are through dusty places. An engine block heater can be a big If any one of these istrue for your help if you have topark outside in very vehicle, you needto change your oil and filter every 3,000 miles (5 000 km) or 3 cold weather, 0°F ( - B O C ) or colder. If your vehicle has this option, see the months-whichever comes first. If the CHANGE OIL NOW message appears I d a under Engine Block Heater. in the optional information center, you should change youroil. 231