See also:

Coolant
The coolant should be changed at the intervals specified in the maintenance schedule. ...

Exhaust Emission Control System
The Exhaust Emission Control System is a highly effective system which controls exhaust emissions while maintaining good vehicle performace. ...

Evaporative Emission Control (Including ORVR: Onboard Refueling Vapor Recovery) System
The Evaporative Emission Control System is designed to prevent fuel vapors from escaping into the atmosphere. (The ORVR system is designed to allow the vapors from the fuel tank to be loaded into ...