According to the manufacturer's maintenance schedule for your vehicle (located in the back of your owner's manual, if you wish to see a copy), the recommended oil change interval for your yukon is every 7500 miles under normal driving conditions.
Under conditions which the manufacturer defines as "severe service", the recommended change interval is every 3,000 miles. In general, sever service is defined as trailer towing, extended high speed operation, routine periods of extended idling (such as for a delivery vehicle), frequent short trips which result in the engine not warming up completely, or routine operation in extreme temperatures.
In addition, your vehicle has a maintenance monitoring system which calculates when service is due depending on how your vehicle is operated. For example, if your vehicle is operated for rfrequent short trips, or at extended periods of high speeds, the computer would track this and turn on the oil change reminder indicator on the instrument panel to let you know when the oil should be about worn out.
You are doing no harm by changing your oil more frequently than might be required, so you may wish to continue doing so. If you would like to go a little longer between oil changes, this should not hurt anything either, as long as you have the vehicle serviced either when the oil change reminder comes on, or within 7500 miles.
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SCHEDULED MAINTENANCE When the "CHANGE ENGINE OIL" light comes on, it means that service is required for your vehicle. Have your vehicle serviced as soon as possible within the next 1 000 km (600 miles). It is possible that, if you are driving under the best conditions, the engine oil life system may not indicate that vehicle service is necessary for over a year. However, your engine oil and filter must be changed at least once a year and at this time the system must be reset.If the engine oil life system is ever reset accidentally, you must service your vehicle within 5 000 km (3,000 miles) since your last service. Remember to reset the oil life system whenever the oil is changed. Refer to Engine Oil Life System for information on the engine Oil Life System and resetting the system.When the "CHANGE ENGINE OIL" light appears, certain services, checks and inspections are required. Required services are described in the following for "Maintenance I" and "Maintenance II." Generally, it is recommended that your first service be Maintenance I, your second service be Maintenance II and that you alternate Maintenance I and Maintenance II thereafter. However, in some cases, Maintenance II may be required more often.
INDICATOR BASED VS. NORMAL/SEVERE SERVICE "Normal/Severe Service" (Mileage Intervals) is for quick reference only.Mileage based service information found under "Normal or Severe Service" is provided to help repair facilities quickly determine the necessary work for each normally scheduled maintenance interval. They are based on the manufactures recommended "average" mileage for each item. However, this vehicle is equipped with an "Indicator Based Service". The system takes into consideration actual driving conditions which either extend or shorten the mileage interval between the normally scheduled maintenance intervals. This system alerts the driver by an indicator in the instrument cluster the "Service" is due. The driver then would normally make an appointment for the necessary work to be completed as per the "Indicator Based Service" requirements.If confusion arises over when and what would be done for a particular maintenance schedule interval, the repair facility should refer to the "Indicator Based Service" information for complete instruction on how to use the system.