1994 GMC Suburban Owner's Manual - Page 272

This doughnut-shaped logo (symbol) is used on most oil containers tohelp you select the correct oil. You should look for this on the oil 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. Your GM 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 than 4 miles (6 km). It's below freezing outside and most trips are less than I O miles (16 km). 0 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. 0 The vehicle is frequently operated off-road. If any of these is true for your vehicle, then you need to change your oil and filter every 2,500 miles (4 000 km) or 3 months - whichever comes first. If none of them is true, change the oil and filterevery 5,000 miles (8 000 km) or 12 months - whichever comes first. What to Do with Used Oil Did you know that used engine oil contains certain elements that may be unhealthy for your skin and could even cause cancer?Don't let used oil stay on your skin for very long. Clean your skin and nails with soap and water, or a good hand cleaner. Wash or properly throw away clothing or rags containing used engine oil. (Seethe manufacturer's warnings about the use and disposal of oil products.) Used oil can be a real threat to the environment. If you change your own oil, be sure to drain all free-flowing oil from the filter before disposal. Don't ever disposeof oil by putting it in the trash, pouring it on the ground, into sewers, or into streams or bodies of water. Instead, recycle it by taking it to a place that collects used oil. If you have a problem properly disposing of your used oil, ask your dealer, a service station or a local recycling center for help. 6-26