11-05-13, 10:59 AM
Realistically they are a consumable for pretty much any modern vehicle - they have a very long lifespan (in comparison to say engine oil), but I can't really think of much these days that doesn't require it changed (or the counterpart cam belt for most cars) at some point in the vehicles life
The chains and belts stretch and wear overtime to the point that they need to be replaced or you risk engine damage - in this case in a very very severe instance you would end up with the pistons hitting the valves before they close
The chains and belts stretch and wear overtime to the point that they need to be replaced or you risk engine damage - in this case in a very very severe instance you would end up with the pistons hitting the valves before they close