I will start with this information on an 03 Cadillac DeVille
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Maintenance Schedule
Normal Vehicle Use
The maintenance instructions contained in this Maintenance Schedule are based on the assumption that the vehicle will be used as designed:
• To carry passengers and cargo within the recommended limitations as indicated on the Tire Placard located on the edge of the driver door.
• On reasonable road surfaces within legal driving limits.
• On unleaded gasoline of the recommended type. For information on the proper type of fuel to use, refer to the Owner's Manual.

Maintenance Schedule Intervals
The services shown in this schedule up to (100,000 mi) should be performed after (100,000 mi) at the same intervals. The services shown in this schedule to be performed at (150,000 mi) should be performed after (150,000 mi) at the same intervals.

For explanations of the maintenance inspections and services included in this Maintenance Schedule. Refer to Explanation of Scheduled Services .

For additional maintenance inspections and services which are not included in this Maintenance Schedule. Refer to Periodic Maintenance Inspection

Engine Oil Scheduled Maintenance
Change engine oil and filter as indicated by the GM Oil Life System™ or every 12 months, whichever occurs first. Reset the system.

Your vehicle has a computer system that lets you know when to change the engine oil and filter. This is based on engine revolutions and engine temperature and not on mileage. Based on driving conditions, the mileage at which an oil change will be indicated can vary considerably. For the oil life system to work properly, you must reset the system every time the oil is changed.

When the system has calculated that oil life has been diminished, it will indicate that an oil change is necessary. A CHANGE ENGINE OIL message in the Driver Information Center (DIC) will come on. Change your oil as soon as possible within the next two times you stop for fuel. It is possible that, if you are driving under the best conditions, the oil life system may not indicate that an oil change 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. It is also important to check your oil regularly and keep it at the proper level.

(7,500 mi)
Rotate tires. Refer to Tire Rotation in Tires and Wheels.
An Emission Control Service +.


(15,000 mi)
• Inspect the air cleaner filter. Replace the filter if necessary. If the vehicle is driven in dusty/dirty conditions, inspect filter at every engine oil change. Refer to Air Cleaner Element Replacement in Engine Controls. An Emission Control Service [Dagger].

• Replace passenger compartment air filter. Refer to Passenger Compartment Air Filter Replacement in Heating, Ventilation and Air Conditioning.

• Rotate tires. Refer to Tire Rotation in Tires and Wheels. An Emission Control Service +.


(22,500 mi)
Rotate tires. Refer to Tire Rotation in Tires and Wheels.
An Emission Control Service +.


(30,000 mi)
• Replace passenger compartment air filter. Refer to Passenger Compartment Air Filter Replacement in Heating, Ventilation and Air Conditioning.

• Inspect throttle body bore and valve plate for deposits, open the throttle valve and inspect all surfaces. Clean as required. Refer to Throttle Body Service in Engine Controls. An Emission Control Service [Dagger].

• Rotate tires. Refer to Tire Rotation in Tires and Wheels. An Emission Control Service +.

• Inspect the air cleaner filter. Replace the filter if necessary. If the vehicle is driven in dusty/dirty conditions, inspect filter at every engine oil change. Refer to Air Cleaner Element Replacement in Engine Controls. An Emission Control Service [Dagger].


(37,500 mi)
Rotate tires. Refer to Tire Rotation in Tires and Wheels.
An Emission Control Service +.


(45,000 mi)
• Inspect the air cleaner filter. Replace the filter if necessary. If the vehicle is driven in dusty/dirty conditions, inspect filter at every engine oil change. Refer to Air Cleaner Element Replacement in Engine Controls. An Emission Control Service [Dagger].

• Replace passenger compartment air filter. Refer to Passenger Compartment Air Filter Replacement in Heating, Ventilation and Air Conditioning.

• Rotate tires. Refer to Tire Rotation in Tires and Wheels. An Emission Control Service +.


(50,000 mi)
• Change the automatic transaxle fluid and filter. Refer to Transmission Fluid Checking Procedure in Automatic Transaxle. If the vehicle is mainly driven under one or more of these conditions:

- In heavy city traffic where the outside temperature regularly reaches 32°C (90°F) or higher

- In hilly or mountainous terrain

- When doing frequent trailer towing

- Use such as limousine service

- Uses such as high performance operation

• If you do not use your vehicle under any of these conditions, the fluid and filter do not require change until the message CHANGE TRANS FLUID appears on the Drivers Information Center. Remember to reset the Transaxle Fluid Change Indicator when the fluid and filter have been changed. Refer to Automatic Transmission or Transaxle Fluid Change Indicator - Resetting .


(52,500 mi)
Rotate tires. Refer to Tire Rotation in Tires and Wheels.
An Emission Control Service +.


(60,000 mi)
• Replace passenger compartment air filter. Refer to Passenger Compartment Air Filter Replacement in Heating, Ventilation and Air Conditioning.

• Inspect throttle body bore and valve plate for deposits, open the throttle valve and inspect all surfaces. Clean as required. Refer to Throttle Body Service in Engine Controls. An Emission Control Service [Dagger].

• Rotate tires. Refer to Tire Rotation in Tires and Wheels. An Emission Control Service +.

• Inspect the air cleaner filter. Replace the filter if necessary. If the vehicle is driven in dusty/dirty conditions, inspect filter at every engine oil change. Refer to Air Cleaner Element Replacement in Engine Controls. An Emission Control Service [Dagger].


(67,500 mi)
Rotate tires. Refer to Tire Rotation in Tires and Wheels.
An Emission Control Service +.


(75,000 mi)
• Inspect the air cleaner filter. Replace the filter if necessary. If the vehicle is driven in dusty/dirty conditions, inspect filter at every engine oil change. Refer to Air Cleaner Element Replacement in Engine Controls. An Emission Control Service [Dagger].

• Replace passenger compartment air filter. Refer to Passenger Compartment Air Filter Replacement in Heating, Ventilation and Air Conditioning.

• Rotate tires. Refer to Tire Rotation in Tires and Wheels. An Emission Control Service +.


(82,500 mi)
Rotate tires. Refer to Tire Rotation in Tires and Wheels.
An Emission Control Service +.

(90,000 mi)
• Replace passenger compartment air filter. Refer to Passenger Compartment Air Filter Replacement in Heating, Ventilation and Air Conditioning.

• Inspect throttle body bore and valve plate for deposits, open the throttle valve and inspect all surfaces. Clean as required. Refer to Throttle Body Service in Engine Controls. An Emission Control Service [Dagger].

• Inspect the air cleaner filter. Replace the filter if necessary. If the vehicle is driven in dusty/dirty conditions, inspect filter at every engine oil change. Refer to Air Cleaner Element Replacement in Engine Controls. An Emission Control Service [Dagger].

• Rotate tires. Refer to Tire Rotation in Tires and Wheels. An Emission Control Service +.

(97,500 mi)
Rotate tires. Refer to Tire Rotation in Tires and Wheels.
An Emission Control Service +.

(100,000 mi)
• Replace spark plugs. Refer to Spark Plug Replacement in Engine Controls. An Emission Control Service [Dagger].

• Change the automatic transaxle fluid and filter. Refer to Transmission Fluid Checking Procedure in Automatic Transaxle. If the vehicle is mainly driven under one or more of these conditions:

- In heavy city traffic where the outside temperature regularly reaches 32°C (90°F) or higher

- In hilly or mountainous terrain

- When doing frequent trailer towing

- Use such as limousine service

- Uses such as high performance operation

• If you do not use your vehicle under any of these conditions, the fluid and filter do not require change until the message CHANGE TRANS FLUID appears on the Drivers Information Center. Remember to reset the Transaxle Fluid Change Indicator when the fluid and filter have been changed. Refer to Automatic Transmission or Transaxle Fluid Change Indicator - Resetting .


(150,000 mi)
• Drain, flush and refill the cooling system (or every 60 months since last service, whichever occurs first). Refer to Draining and Filling Cooling System in Engine Cooling.

• Inspect the hoses.

• Clean the radiator, condenser, pressure cap and neck. If there is a loss of coolant, refer to Loss of Coolant in Engine Cooling.

• Inspect engine accessory drive belt. Replace if needed. Refer to Drive Belt Replacement in Engine Mechani
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Explanation of Scheduled Services
For time and/or mileage intervals of scheduled maintenance items, refer to Maintenance Schedule .

The following text and illustration describe the details of the required scheduled maintenance services.

For information on the proper fluids and lubricants to use, refer to Fluid and Lubricant Recommendations .

Engine Oil and Oil Filter Change
Replace the engine oil and the engine oil filter.

For vehicles without an oil cooler, refer to Engine Oil and Oil Filter Replacement in Engine Mechanical.

Engine Oil Quality
Oils of the proper quality for the vehicle can be identified by looking for the STARBURST symbol. The STARBURST symbol indicates that the oil has been certified by the American Petroleum Institute (API), and is preferred for use in gasoline engines.

Engine Oil Viscosity

Notice: Using oils of any viscosity other than those recommended could result in engine damage. When choosing an oil, consider the range of temperatures the vehicle will be operated in before the next oil change. Then, select the recommended oil viscosity.

SAE 5W-30 is the only viscosity grade recommended for your vehicle.

Use only oils which have the API Starburst symbol and which are also identified as SAE 5W-30.

If the temperature range is 0°F (-18°C) or above SAE 10W-30 oil which has the API Starbust symbol is acceptable if SAE 5W 30 oils is not available. Areas where the temperature falls below -20°F (-29°C), it is recommended either an SAE 5W-30 synthetic oil or and SAE 0W-30 oil. Both will provide easier cold starting and better protection for the engine at extremely low temperatures. Do not use other viscosity grade oils, such as SAE 10W-40 or SAE 20W-50 under any conditions.

Chassis Lubrication
Notice: Do not lubricate the parking brake cables. Lubrication destroys the plastic coating on the cable.

Lubricate transaxle shift linkage. Lubricate the parking brake guides, underbody contact points and linkage.

Tire and Wheel Inspection and Rotation
Tires should be rotated every 7,500 miles.


Check the tires for abnormal wear or damage. If irregular or premature tire wear exists, refer to Tire Diagnosis - Irregular or Premature Wear in Tires and Wheels.

Ensure the spare tire is stored securely. Push, pull, and then try to rotate or turn the tire. If it moves, use the folding wrench to tighten the cable. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.

Rotate the tires to equalize the wear and obtain maximum tire life. Refer to Tire Rotation in Tires and Wheels.

When rotating tires, always use the correct rotation pattern shown here.

Do not include the compact spare tire in tire rotation.

After the tires have been rotated, adjusted the front and rear inflation pressures as shown on the Certification/Tire label. Ensure that all wheel nuts are properly tightened. Refer to Capacities - Approximate Fluid .


Accessory Drive Belt Inspection
Inspect the accessory drive belts for the following
Cracks
Fraying
Wear
Proper tension
Replace as needed. Belts can have many small cracks in individual ribs without affecting the performance.

Brake System Inspection
Inspect brake lines and hoses for proper hook-up binding, leaks, cracks or chafing. Refer to Brake Pipe and Hose Inspection in Hydraulic Brakes. Inspect disc brake pads for wear. Refer to Brake Pad Inspection in Disc Brakes. Inspect the rotors for poor surface condition. Inspect other brake system components, including the brake calipers and the parking brake. Check the parking brake adjustment. The brakes may need to be inspected more often if the customer driving habits or conditions result in frequent braking.

Automatic Transmission Service
Change the transmission fluid and the transaxle fluid filter according to the maintenance schedule intervals. Use the proper fluids. For the fluid and filter changing procedure refer to Fluid Level Indicator Replacement in Automatic Transmission/Transaxle.

For time and/or mileage intervals of scheduled maintenance items, refer to Maintenance Schedule .

Drive Belt Inspection
Inspect the drive belt according to the maintenance schedule intervals.

For time and/or mileage intervals of scheduled maintenance items, refer to Maintenance Schedule .

Inspect the drive belt for the following:
Cracks
Fraying
Wear
Proper tension
Replace as needed. For drive belt replacement, refer to Drive Belt Installation in Engine Mechanical.

Cooling System Service
Drain, flush and refill the cooling system with new coolant. Refer to Draining and Filling Cooling System in Engine Cooling.

Spark Plug Replacement
Replace the spark plugs according to the maintenance schedule intervals.

For the time and/or mileage intervals of scheduled maintenance items, refer to Maintenance Schedule .

For information on the correct type of spark plug, refer to Maintenance Items .

Spark Plug Wire Inspection
Clean the spark plug wires and inspect for burns, cracks or other damage. Ensure that the fit between the spark plug wire boots at the spark plugs and at the coils is snug. Replace the spark plug wires as needed.

Air Cleaner Filter Replacement
Replace the air cleaner filter according to the maintenance schedule intervals. For time and/or mileage intervals of scheduled maintenance items, refer to Maintenance Schedule .

2003 Cadillac DeVille

Owner Checks and Services
The following information covers the inspections and services required to retain the safety, dependability, and emission control performance of the vehicle.

Ensure the necessary repairs are completed at once. Whenever any fluids or lubricants are added to the vehicle, ensure that they are the proper ones.

At Each Fuel Fill
It is important to perform these underhood inspections at each fuel fill.

Engine Oil Level Check
Inspect the engine oil level and add the proper oil if necessary.

Engine Coolant Level Check
Inspect the engine coolant levels and add DEX-COOL® for the proper coolant mixture, if necessary.

Windshield Washer Fluid Level Check
Inspect the windshield washer fluid level in the windshield washer reservoir and add the proper fluid, if necessary.

At Least Once a Month
Tire Inflation Check
Inspect tire inflation. Ensure the tires are inflated to the pressures specified on the Certification/Tire label located on the driver's door lock pillar or refer to Tire Inflation Pressure Specifications .

Cassette Deck Service
Clean cassette decks. Cleaning should be done every 50 hours of tape play. Refer to Cassette Player Care and Cleaning in Entertainment.

At Least Twice A Year
Restraint System Check
Ensure the safety belt reminder light and all of the belts, buckles, latch plates, retractors, and anchorages are working properly. Look for any other loose or damaged safety belt system parts. If you see anything that might keep a safety belt system from doing its job, have it repaired. Have any torn or frayed safety belts replaced.

Also look for any opened or broken air bag coverings, and have them repaired or replaced. The SIR system does not need regular maintenance.

Wiper Blade Check
Inspect wiper blades for wear or cracking. Replace blade inserts that appear worn or damaged or that streak or miss areas of the windshield. Refer to Wiper Arm Blade Replacement in Wipers/Washer Systems.

Weatherstrip Lubrication
Silicone grease on weatherstrips will make them last longer, seal better, and not stick or squeak. apply silicone grease with a clean cloth. During very cold, damp weather more frequent application may be required. Refer to Fluid and Lubricant Recommendations .

Automatic Transmission Check
Inspect the automatic transmission fluid level. Refer to Transmission Fluid Checking Procedure in Automatic Transaxle-4T80-E. Add if needed. A fluid loss may indicate a problem. Inspect the system and repair as needed. Refer to Fluid and Lubricant Recommendations .

At Least Once a Year
Key Lock Cylinders Service
Lubricate the key lock cylinders with the recommended lubricant.

Body Lubrication Service
Lubricate all of the following areas:

All body door hinge pins
All body hood hinge pins
the hood latch assembly
The pivots
The release pawl
The rear compartment hinges
The rear compartment latch
The fuel door hinge
The seat hardware
More frequent lubrication may be required when exposed to a corrosive environment. In order to locate the proper lubricant. Refer to Fluid and Lubricant Recommendations .

Starter Switch Check
Caution: When performing this check, the vehicle could move suddenly. Personal injury or property damage may result. Make sure there is enough room around the vehicle, in case the vehicle does move. Do not use the accelerator pedal, and be ready to turn OFF the engine immediately if it starts.

Before you start, ensure you have enough room around the vehicle.
Firmly apply both the park brake and the regular brake.
Try to start the engine in each gear. The starter should work only in PARK (P) or NEUTRAL (N). If the starter works in any other position, the vehicle needs service.
Automatic Transaxle Shift Lock Control System Check
Caution: When performing this check, the vehicle could begin to move. Personal injury or property damage may result. Make sure there is enough room in front of the vehicle, in case the vehicle begins to roll. Be ready to apply the regular brake immediately should the vehicle begin to move.

Before you start, ensure you have enough room around the vehicle. It should be parked on a level surface.
Firmly apply the parking brake.
With the engine off, turn the ignition key to the ON position, but do not start the engine. Without applying the regular brake, try to move the shift lever out of PARK (P) with normal effort. If the shift lever moves out of PARK (P), your vehicle needs service.
Ignition Transaxle Lock Check
While parked, and with the parking brake set, try to turn the ignition key to OFF in each shift lever position.

The key should turn to the OFF position only when the shift lever is in PARK (P).
The key should come out only in the OFF position.
Park Brake and Automatic Transaxle PARK (P) Mechanism Check
Caution: When performing this check, the vehicle could begin to move. You or others could be injured and property could be damaged. Make sure there is room in front of the vehicle in case the vehicle begins to roll. Be ready to apply the regular brake at once, should the vehicle begin to move.

Park on a fairly steep hill, with the vehicle facing downhill. Keeping your foot on the regular brake, set the parking brake.

To check the parking brake's holding ability: With the engine running and transaxle in NEUTRAL (N), slowly remove foot pressure from the regular brake pedal. Do this until the vehicle is held by the parking brake.
To check the PARK (P) mechanism's holding ability: With the engine running, shift to PARK (P). Then release all brakes.
Underbody Flushing Service
At least every spring, use plain water to flush any corrosive materials from the underbody. Take care to clean thoroughly any areas where mud and other debris can collect.

2003 Cadillac DeVille
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Periodic Maintenance Inspection
Listed below are inspections and services which should be performed at least twice a year, for instance, each spring and fall. A dealer's service department or qualified service center should perform these inspections. All repairs should be completed at once.

Steering, Suspension and Front Drive Axle Boot and Seal Inspection
Inspect the front and the rear suspension and steering system for damaged, loose or missing parts, signs of wear or lack of lubrication. Inspect the power steering lines and hoses for proper hook-up, binding, leaks, cracks, chafing, etc. Clean and then inspect the drive axle boot seals for damage, tears or leakage. Service the vehicle as necessary.

Exhaust System Inspection
Inspect the complete system. Inspect the body near the exhaust system. Look for broken, damaged, missing or out-of-position parts as well as open seams, holes, loose connections or other conditions which could cause a heat build-up in the floor pan or could let exhaust fumes into the vehicle. Service the vehicle as necessary.

Fuel System Inspection
Inspect the complete fuel system for damage or leaks.

Engine Cooling System Inspection
Inspect the hoses and replace them if they are cracked, swollen or deteriorated. Inspect all pipes, fittings and clamps; replace as needed. Clean the outside of the radiator and air conditioning condenser. To help ensure proper operation, a pressure test of the cooling system and pressure cap is recommended at least once per year.

Throttle System Inspection

Important
The accelerator and cruise control cables should not be lubricated under any condition. Throttle system components causing hesitation or sticking should be replaced.


Inspect the following:

Missing parts such as retainers or clips
Interference of the linkage or the cable conduit to critical components such as fuel lines, brake lines, harness leads, etc.
Proximity of the cable to the exhaust system and other heat sources, check for melting and/or discoloration
Cable kinking. Avoid sharp bends of cables
Clearance of the throttle system moving parts throughout their travel from other stationary component.
Damage of the components due to cable kinking, severe kinking, severe abrasion, misalignment, etc. If any of the above conditions exists, notify your dealer for a recommended rerouting, adjustment, or replacement
Brake System Inspection
Inspect the complete system. Inspect the brake lines and the hoses for proper hook-up, binding, leaks, cracks, chafing, etc. Inspect the disc brake pads for wear and rotors for surface condition. Inspect other brake parts, including calipers, parking brake, etc. The brakes may need to be inspected more often if driving habits or conditions result in frequent braking.

We recommend an alignment. I suggest cleaning the caliper brackets in the area that the pads sit. In our area that rust up so bad the pads get stuck in place. Every 12K