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The 2008 Chevrolet Silverado should go in for maintenance every 7,500 miles. During each service, it's necessary to rotate the tires, inspect the engine oil level and condition, change the oil and filter if needed. It's recommended to replace the engine air cleaner every four years, or at the mileage intervals of 45,000, 90,000, and 135,000. Additionally, consider changing the automatic transmission fluid (if applicable) or the transfer case fluid at these same intervals as the air cleaner, and have the evaporative control system checked. Spark plugs and wires should be replaced at 97,500 miles. Upon reaching 150,000 miles, it's advisable to flush and refill the engine cooling system (or every five years - whichever comes first) and inspect the engine accessory drive belts for signs of wear and tear like fraying, cracks, or damage.
For the 2008 Chevy Silverado, it's recommended to have an oil change every 7,500 miles, replace the cabin air filter every 22,500 miles, change the transmission and transfer case fluid at 45,000 miles, and replace the spark plugs at 90,000 miles.