modern run of the mill diesel cars make a bit of g/b noise. i wouldnt say clattering ther just not made to fine tolerance by shimming shafts bearings etc newer stuff takes allot thinner oil these days from the treacle that once was in them. new citroen m8 bought recent whine like fuk thats bran new. i cant hear yours just run it past some body in the no. make sure its got the right oil in it its a common mistake