Chris E:
I seem to have upset you. This was not my intention as I was merely giving my opinion based on various factors, including reliable sources. Check out Glasses or Blacks CURRENT price guides - or indeed the back of any good car magazine - and see if you can find a large petrol engine that holds its value better than the equivalent diesel model. You wont. Surely their opinion is the most reliable?
On that point, why are you comparing the 330i with the 335d? Surely you are aware that it is not BHP which makes a Diesel engine comparable with a Petrol one? Both on price and Torque levels the 335d is in another league to the 330i. I think a farer comparison would be the 330i/330d or 335i/335d.
I agree the Diesel emits more of certain other pollutants but this is irrelevant to most buyers and indeed residual values, as the goverment only tax based on CO2 output.
On the driveabilty aspect I am not sure if you have driven a modern Diesel engine? The low down torque on offer is a world away from a high revving petrol. In stop/start town driving comes into it own. A high revving petrol DCG equipped car is not really designed for this sort of driving. However, if you spend most of yours hours behind the wheel driving around country roads flat-out i can see your point but dont forget that many people (myself included) dont like any kind of Auto-Box, especially when driving for pleasure. Also, DCG/DSG etc are not even available in many car ranges. Thirdly, this kind of transmission generally adds around £1400 to the price - a sum you will never get back come resale time, which will hurt Resdiual Values even further.
I dont doubt that Diesels popularity is currently waning slightly on the continent, but that has alot to do with current fuel tax policies - which may not last. Also,lets not forget that on the continent Diesel cars account for over 50% of all new cars whilst in the UK its just over 40%. Many company car buyers dont even have the choice of having a petrol engined car and this is likely to be the case for some time with current CO2 based taxes.