1994 GMC Suburban Owner's Manual - Page 337

If you are skilled enough to do some work on your vehicle, you will probably want to get the service information GM publishes. For information on how to obtain various service publications for your vehicle, see "Service Publications" in the Index. You will find a list of publications and an order form in the back of the book. Scheduled Maintenance Services This part tells you the maintenance services that you should have done and the times you should schedule them. Your GM dealer knows your vehicle best and wants you to be happy with it. If you go to your dealer foryour service needs, you'll know that GM-trained and supported servicepeople will perform the work using genuine GM parts. These schedules are forvehicles that: carry passengers and cargo within the recommended limits. You will find these limits on your vehicle's Certification Label. See "Loading Your Vehicle" in the Index. are driven on regular road surfaces, and within legal driving limits, as described in Section 4 "Your Driving and the Road." - are driven off-road in the recommended manner. See "Off Road Driving With Your Four-wheel Drive Vehicle" in the Index. use the recommended fuel. See "Fuel" in the Index. Selecting the Proper Maintenance Services To find the propermaintenance schedule foryour vehicle, you must know two things. What engine your vehicle has, and how you use your vehicle. Your engine type will tell you which chart to use, and your driving conditions will tell you which schedule to use. The charts are found later in this section. Selecting the Proper MaintenanceChart Your engine type (Gasoline orDiesel) and its emissions classification (Light Duty or Heavy Duty Emissions) will tell you which maintenance chart to use. Find your Vehicle Identification Number (VIN), and look at the eighth character to see what your engine code is. Then use the following Engine Emissions Classifications tables to find your emissions classification. Your VIN is on the plate on the top left corner of your instrument panel, the Certification Label and on the Service PartsIdentification Label. See "Vehicle Identification Number" in the Index. If your engine has more than one emissions classification,look at your Certification Label to see what your Gross Vehicle Weight Rating (GVWR) is. See "Loading Your Vehicle" in the Index.