1) What year did the common rail diesel engine start on the 3 series?

The clue is in the name - 330d is common rail where as a 325tds is a rotary pump.

2) 330D M Sport - is it only cosmetic changes or is there a power increase as well?

3) Some adverts say 180bhp, some say 204bhp. Is it the M Sport that has the 204 bhp or does the normal 330d come with it as well?

Depends on the engine...

4) Is the auto box good and reliable or should i look at manual ones only?

Its good for about 100k...


Seems to be a decent spec list for the money imo and they seem to average in the late 30 MPG

And dont forget a remap!