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One of the major selling points for us on the D3 was the width of the 2nd row seating, near full size 3rd row seats (comfortably big enough for adults) and the large boot space. Massive when the 2nd row seats are down. A very practical and comfortable car for between 2 and 7 adults. This space was a priority for us. Something for you to consider when looking at other cars.
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The D4 interior is just so much better than the D3 its insane. Its very Range Rover. Having said that the D3 interior smacks of being more utilitarian which suits some people and some build ups.
Apart from 1-2 hot mile TD's modern TD's are not a million k proposition like the old naturally aspirated mechanical fuel injection motors were if well looked after.
It depends also on how long you are holding the vehicle for. If you are thinking a 10 year or more proposition and are looking at very h k's and probable engine re-build try to find out what those things costs in petrol v diesel.
Cheers