5.3L V8 Engine with 4-Speed Automatic Transmission:
* Engine Oil and Filter: Every 3,000-5,000 miles or 6 months, whichever comes first.
* Transmission Fluid: Every 100,000 miles or 7 years, whichever comes first.
* Transfer Case Fluid (4WD Models): Every 50,000 miles or 5 years, whichever comes first.
* Rear Axle Fluid (Non-Locking Differential): Every 30,000 miles or 3 years, whichever comes first.
* Rear Axle Fluid (Locking Differential): Every 50,000 miles or 5 years, whichever comes first.
* Brake Fluid: Every 2 years or 24,000 miles, whichever comes first.
* Coolant: Every 5 years or 150,000 miles, whichever comes first.
6.0L V8 Engine with 4-Speed Automatic Transmission:
* Engine Oil and Filter: Every 3,000-5,000 miles or 6 months, whichever comes first.
* Transmission Fluid: Every 50,000 miles or 5 years, whichever comes first.
* Transfer Case Fluid (4WD Models): Every 50,000 miles or 5 years, whichever comes first.
* Rear Axle Fluid: Every 50,000 miles or 5 years, whichever comes first.
* Brake Fluid: Every 2 years or 24,000 miles, whichever comes first.
* Coolant: Every 5 years or 150,000 miles, whichever comes first.
Please note that these intervals are for normal driving conditions. If you drive in severe conditions, such as towing heavy loads or frequent off-road use, you may need to change the fluids more frequently. Always refer to your vehicle's owner's manual for the specific maintenance schedule and recommendations for your Avalanche.
