Every 5,000 to 7,500 miles:

• Change engine oil and oil filter
• Inspect tires for wear and rotate if necessary
• Check and top-up all fluid levels (coolant, brake fluid, power steering fluid, windshield washer fluid)
• Inspect brake system, including brake pads, rotors, and brake lines
• Inspect and replace air filter if necessary
• Check battery condition and clean terminals if needed
• Inspect and adjust tire pressure

Every 15,000 to 30,000 miles:

• Perform the maintenance tasks mentioned for the 5,000 to 7,500-mile interval
• Replace cabin air filter
• Inspect the suspension components for wear or damage
• Inspect the exhaust system for leaks or damage
• Inspect the drive belts for wear and proper tension
• Inspect the cooling system, including hoses and radiator
• Check and replace spark plugs if necessary

Every 30,000 to 60,000 miles:

• Perform the maintenance tasks mentioned for the previous intervals
• Replace transmission fluid and filter
• Flush and replace the coolant
• Inspect and replace the fuel filter if applicable
• Inspect and lubricate the chassis components, including ball joints and steering linkage
• Inspect the ignition system and replace ignition wires if needed

Every 60,000 miles and beyond:

• Repeat the maintenance tasks mentioned for the previous intervals
• Replace the timing belt if your Trailblazer is equipped with one (timing belt replacement interval can vary, so consult your owner's manual)
• Inspect the fuel system, including the fuel injectors and fuel lines
• Inspect the emission control system
• Inspect the differential fluid
• Inspect and replace the PCV valve if necessary

Again, please remember that this is a general maintenance schedule, and your specific vehicle may have different requirements. Consult your owner's manual or contact a certified Chevrolet dealer for the most accurate and tailored maintenance schedule for your Chevrolet Trailblazer.