Depends. D4 was launched with the 3.0TDV6. 245bhp. Dpf optional. Around 2012, it was rebadged SDV6, got the 8sp gearbox and power upped to about 255 bhp. Dpf standard. A TDV6 became a detuned version with 210bhp and was used in the commercial only I think. Later revisions added ad-blue. The main advantage of an SDV6 is probably the 8sp gearbox. Disadvantage is more complicated bits bolted on.If going for a 4 what's the thoughts on the SDV6? thought of as the best engine I thought