I'm just looking to buy a 2010 Black Edition CR140, but I'd like to know when the Timing Belt is supposed to be changed. I imagine the interval is in the Service book, but as I haven't bought it yet I can't have a look and I don't want to buy one that's overdue. I can't find it through the search function either. There's just loads of info on the PD engines. Can anybody tell me what mileage/age it's due a change please. Thanks.