2008 Cadillac STS Owner's Manual - Page 457

(i) If using DOT-4 brake fluid only: Drain, flush, and refill brake hydraulic system at a regular maintenance service every two years. This service can be complex; you should have your dealer/retailer perform this service. See Brakes on page 5-41. (j) Drain, flush, and refill cooling system. This service can be complex; you should have your dealer/retailer perform this service. See Engine Coolant on page 5-25 for what to use. Inspect hoses. Clean radiator, condenser, pressure cap, and filler neck. Pressure test the cooling system and pressure cap. (k) A fluid loss in any vehicle system could indicate a problem. Have the system inspected and repaired and the fluid level checked. Add fluid if needed. (l) Drain, flush, and refill intercooler system. This service can be complex; you should have your dealer/retailer perform this service. See Engine Coolant on page 5-25. (m) If you drive regularly under dusty conditions, inspect the filter at each engine oil change. (n) Visually inspect belt for fraying, excessive cracks, or obvious damage. Replace belt if necessary. Owner Checks and Services These owner checks and services should be performed at the intervals specified to help ensure the safety, dependability, and emission control performance of your vehicle. Your dealer/retailer can assist you with these checks and services. Be sure any necessary repairs are completed at once. Whenever any fluids or lubricants are added to your vehicle, make sure they are the proper ones, as shown in Recommended Fluids and Lubricants on page 6-13. At Each Fuel Fill It is important to perform these underhood checks at each fuel fill. Engine Oil Level Check Notice: It is important to check the engine oil regularly and keep it at the proper level. Failure to keep the engine oil at the proper level can cause damage to the engine not covered by your warranty. Check the engine oil level and add the proper oil if necessary. See Engine Oil on page 5-18. 6-9