I wonder why the previous owner decided against a cambelt change? Seems a bit daft! Can't believe that. Are you getting new spark plugs? Not part of a service, costs extra on top from dealer. I'm thinking if the previous owner chose not to change the cambelt even tho I'm sure the dealer would have advised to, they might have said no to plugs as well meaning yours could be the original still? Plus yours are due even if they did change them. Every 60k my book says even tho iridium are meant to last 100k.