My Audi Q3 diesel is 5 years old and has covered 46,000 miles. The dealer says it needs a new belt and water pump for £1300, but according to my service schedule, it isn’t due yet. I’ve had a mechanic look at the belt and he said it’s in perfect condition and he wouldn’t personally replace it till it’s covered 75,000 miles or 10 years — whichever comes first. The dealer say they prefer to err on the side of caution! What do you recommend? Are they just scaremongering in order to get me to spend my money when it’s not necessary or should I have it done (albeit at a recommended garage, not Audi). Thanks in advance for your advice.