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A good thread with some interesting comments and insights. Later this year we could be looking at trading up from our 2011 X3 30d to an X5. While the diesels are our preferred option (what we here in Australia call the 30d and 40d), I'll also be considering the 35i.
One issue I've noticed with the X3 30d is that (as noted by Aviator JPN above) is that the diesel - while certainly more fuel efficient than the petrol/gas equivalent - isn't as fuel efficient as the official figures suggest. Gas is more closer to its official fuel consumption than diesel (and hybrid is even further away from what I read).
Also I agree with the notion that over the short term (up to 3-5 years) there should be very little to separate the maintenance costs of gas vs diesel. Longer term - and especially out of warranty - diesel repairs can be very expensive.
Just a side note on diesel engine designation. I'm relatively new to this X5 Forum and it took me a while (I'm a little slow) to appreciate that BMW uses different designations for its diesel engines in different markets. What is called the 35d in the US/Canada is called the 30d in Europe and here in Australia. This 35d/30d diesel engine has only a single turbo charger to produce 255hp/413lb-ft (190kW/560Nm) with 0-62mph in 6.9sec. It is the 40d (as available in Europe and here in Australia) which has two turbochargers. It produces 230kW/630Nm or 313hp/465lb-ft with 0-62mph in 5.9sec for the X5. Then we have the M50d with three turbochargers to produce 280kW/740Nm or 381hp/545lf-ft with 0-62mph in 5.3 sec for the X5.
Tony
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