Every 5,000 to 7,500 miles:

• Change the engine oil and replace the oil filter to ensure proper lubrication and engine performance.
• Inspect the tires for wear and rotate them to promote even tread wear and extend tire life.
• Check and top-up all fluid levels, including coolant, brake fluid, power steering fluid, and windshield washer fluid, to maintain optimal levels for proper vehicle operation.
• Inspect the brake system, including brake pads, rotors, and brake lines, to ensure they are in good condition and functioning correctly.
• Inspect and replace the air filter if necessary to maintain clean airflow to the engine.
• Check the battery condition and clean the terminals to ensure a reliable electrical system.
• Inspect and adjust tire pressure to maintain proper inflation levels for improved safety and fuel efficiency.

Every 15,000 to 30,000 miles:

• Perform all the maintenance tasks mentioned for the 5,000 to 7,500-mile interval.
• Replace the cabin air filter to ensure clean air circulation inside the vehicle.
• Inspect the suspension components, including shocks, struts, and bushings, for wear or damage, ensuring a comfortable and controlled ride.
• Inspect the exhaust system for leaks or damage, ensuring proper emissions and exhaust flow.
• Inspect the drive belts for wear and proper tension, replacing them if necessary to prevent belt failure.
• Inspect the cooling system, including hoses and radiator, for leaks or damage, and flush and replace the coolant to prevent overheating and maintain engine temperature control.
• Check and replace the spark plugs if necessary for efficient ignition and optimal engine performance.

Every 30,000 to 60,000 miles:

• Perform all the maintenance tasks mentioned for the previous intervals.
• Replace the transmission fluid and filter to ensure smooth shifting and proper transmission operation.
• Flush and replace the coolant to maintain optimal engine temperature regulation.
• Inspect and replace the fuel filter if applicable, ensuring proper fuel flow and preventing contaminants from reaching the engine.
• Inspect and lubricate the chassis components, including ball joints and steering linkage, to maintain proper steering and suspension operation.
• Inspect the ignition system, including ignition wires, and replace them if needed for reliable engine starting.

Every 60,000 to 100,000 miles:

• Repeat all the maintenance tasks mentioned for the previous intervals.
• Replace the timing belt if your XT4 is equipped with one (timing belt replacement interval can vary, so consult your owner's manual) to prevent belt failure and engine damage.
• Inspect the fuel system, including the fuel injectors and fuel lines, for proper operation and clean them if necessary.
• Inspect the emission control system to ensure compliance with emission standards.
• Inspect the differential fluid to maintain proper lubrication and prevent component damage.
• Inspect and replace the PCV (Positive Crankcase Ventilation) valve if necessary to maintain proper crankcase ventilation.

Please note that this is a general maintenance schedule, and it's always best to refer to your owner's manual or consult with a certified Cadillac dealer for the most accurate and specific maintenance recommendations for your Cadillac XT4.