1993 Cadillac Seville Owner's Manual - Page 289

This doughnut-shaped logo (symbol) is used most oil containers to on help you select the correct oil. You should look for this on theoil container, and use only those oils that display the logo. 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. YourCadillac dealer is ready to advise if you think something should be added. When to Change Engine Oil: Your vehicle isequipped with an engine oil life index (EOLI) feature as of the Driver Information Center part display (DIC). Oil change intervals are determined by the EOLIand will usually fallat, orbetween, the two recommended alternative intervals of 3,000 miles (5,000 kilometers) and 7,500 miles (12,500 kilometers), but could be shorter than3,000 miles (5,000 kilometers) under some very severe driving conditions shown in Schedule I. The system will also indicate the need for an oil change if 7,500 miles (12,500 kilometers) or one year has passed. Engine oil life remainingis displayed through engine data as the 'OIL LIFE INDEX' and as a 'CHANGE ENGINE OIL message. The 'OIL LIFE INDEX' display includesa number between 0 and 100. This is the percentage of oil lifeREMAINING based on driving conditions and mileage driven sincethe last time of the oil lifeindicator was reset. When the remaining oil life is less than lo%, a 'CHANGE OIL SOON' message will appear. This is a reminder to schedule an engine oil change. When the oil life index reaches 0, the 'CHANGE ENGINE OIL: message will appear. This indicates that nooil life remains and the oil should be changed as soon as possible,but certainly withinthe next 200 miles (320 km). The EOLIwill not detect excessively dustyconditions or engine malfunctions which may effect oil. If you drive in dustyareas, change the the engine oil after every 3,000 miles (5,000 kilometers) or 3 months (whichever comesfirst), unless instructed to do so sooner by the DIC. On Northstar 4.6 Liter engine equipped vehicles a 'CHECK OIL LEVEE message will appear whenever the oil level's approximately quart low. one 275