I carry spares on my boat for routine maintenance ie filters alternator belts spare alternator would I call them to replace an alternator belt no I would not, this is a part that has failed and like your starter motor is covered in their t & c, like your starter motor would you be happy if your starter motor failed and they told you its not covered due to age wear and tear,they also told me that if its the rubber seals in the injection pump its not covered yet as in their T & c it states rubber seals that require routine wear and tear replacement are not covered yet this rubber seal is not something that you would replace on a regular interval or servicing.