1995 GMC Sonoma Owner's Manual - Page 230

Four-wheel Drive Remote Oil Filter If your vehicle has four-wheel drive, you will have a remote oil filter. There is a special access door in the steering linkage shield assembly located under the radiator support. Twist the screw to lock or unlock the door. Engine Coolant Heater An engine coolant heater can be a big help if you have to park outside in very cold weather, 0°F (-1 8OC) or colder. If your vehicle has this option, see "Engine Coolant Heater" in the Index. 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. (See the 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 dispose of 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. Air CIeaner To remove the round air cleaner filter for the 4.3L (VTN 2 ) engine, turn the wing nuts counterclockwise. Remove the cover and change the filter. Care should be taken during reassembly to ensure that the cover is on straight and the wingnuts are properly tightened. To avoid ingesting dust in the engine, the arrow on the air cleaner lid should point to the front of the engine. 6- 12