Belts usually require changing every 5-7 years although this can vary by manufacturer, Chains are meant to be lifetime parts but on certain engines (BMW / Mini 2.0 Diesel) we have seen them suffer catastrophic failures at ~80k mileage so we do recommend changing them before they fail, there are sometimes tell-tale signs such as a noisy chain but they have been known to fail without warning.

For more information on whether your vehicle is due a change check your vehicle manual.

Using only OEM specification parts, DRS can replace your timing belt or chain at a very competitive cost, and usually much cheaper than main dealers.