What items should be included in the third car maintenance?

[ColemanAnn]

The items that should be included in the third car maintenance are: 1. Replace engine oil and oil filter; 2. Check the exhaust system for leaks or damage; 3. Visually inspect the engine and other components in the engine compartment for leaks or damage; 4. Clean the air filter housing and replace the filter element if necessary; 5. Check and clean the spark plugs, replacing them if necessary; 6. Check the condition and tension of the timing belt; 7. Check the coolant concentration, adding coolant or adjusting the concentration if necessary; 8. Query the fault memory of the self-diagnosis system; 9. Check the thickness of the brake friction pads.