If it's a timing belt it should be done every 4-5 years or 70k. If it's a timing chain , yes most other only change it if it gets noisey, but should be ok as long as servicing is carried out. If you know what make and model Corsa your daughter has we can tell if it is belt or chain driven.Hi
My daughter's boyfriend's mechanic dad has told her that the timing belt only needs to be changed when it starts making a noise. I'm a bit concerned would you say this is okay or at what mileage should she get it done.