Hi Inhave just bought my daughter a Fiat Fiorino 2013 multi jet van for my daughter, it has 168,000 miles on it with no service history, the van runs fine but just wondered if I should change the timing chain, seen somwhere that it should be done at 150,000 miles, I did ask at the garage and they said if it's always serviced it should not require doing, is it a big job to do, any help would be great.