To change the cruising speed

See also:

Non-turbo models
The engine is designed to operate using unleaded gasoline with an octane rating of 87 AKI (90 RON) or higher. ...

Changing the coolant
Never attempt to remove the radiator cap until the engine has been shut off and has cooled down completely. Since the coolant is under pressure, you may suffer serious burns from a spray of boilin ...

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