my Disco seems really noisy at 1500 rpm, its the same in all gears, its just a normal diesal type noise just seems much lowder at that rpm, before and after 1500 shes almost silent soon as she hits the 1500 she turns into a skip lorry for a few seconds, she drivers fine etc just it bug's me, sounds like a bucket of marbles even when she's warmed right up,
is this the same with your TD5's ???
cheers
H