How often do cams have to be replaced on 2005 Chevy Malibu v6?

The camshafts in a 2005 Chevy Malibu V6 are not typically replaced on a scheduled maintenance basis. Unlike timing belts which have a recommended replacement interval, camshafts are internal engine components that are generally replaced only when they are worn out or damaged. This usually happens due to issues like:

* Excessive wear: This is rare unless the engine has been severely neglected or abused.

* Mechanical failure: A broken lifter or other internal component can damage a camshaft.

* Corrosion: In extreme cases, significant corrosion could compromise the camshaft's integrity.

Therefore, there's no mileage or time-based replacement interval for camshafts. Their condition should be assessed during major engine repairs or if there are noticeable symptoms of engine problems (e.g., rough running, loss of power, unusual noises).