1993 Oldsmobile Achieva Owner's Manual - Page 226

Service & Appearance Care Engine Oil Additives Don't add anything to youroil. Your Oldsmobile dealer is ready to advise if you think something should be added. When to Change Engine Oil See if any one of these is true for you: Most trips are less than4 miles (6 km). It's below freezing outside and most trips are less than 10 miles (16 km). The engine is at low speed most of the time (as in door-to-door delivery, or in stop-and-go traffic). You tow a trailer often. Most trips are through dusty places. If 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. ( S e e the Index under Check Oil Light.) If none of them is true, change theoil every 7,500 miles (12500 km) or 12 months-whichever comes first. Change the filter at the first oil change and at every other oil change afterthat. Engine Block Heater An engine block heater can be big a help if you have to park outside very in cold weather, 0°F (-18"C) or colder. If your vehicle hasthis option, see the Index under Engine Block Heater. ! 2 4