Guys, thank you all very much for your valuable opinions. I sort of guessed that all those with a 30D would suggest it is a better engine. I also note the comments about how valid the 20D is and indeed the 20D has been adequate for me since buying the X3. My only complaint is the relatively noisy N47 and therefore I would like a quieter engine. The B47 may well be fine for me, but as I have said, the car I am thinking about has a far higher spec and lower mileage than the equivalent 20Ds on sale at dealers in East Sussex.
I have now to find out how much the dealer will give me for my car and see if it all works out!!
Thanks again everyone!
Ian
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