Just bought a car with a noisy turbo. Dealer says it's ok but independant mechanics say it's not. What should I do?

I bought an 56 Audi A3 1.9TDi with 80,000 miles last week from a reputable dealer. On the test drive we commented that it sounds like a police car siren. There was a noise coming from the turbo which the...

Valeo of the doldrums

I said I was not happy with the automatic gear change of my eight year old Mercedes-Benz E270CDI. So my MB dealer did some tests and he tells me that the oil in the transmission has become 'contaminated...