given that the BMW is more expensive new, I would expect a higher base spec.
The BMW was not more expensive new - in 2011 for example the A6 2.0 TDI S-Line was £32495 and the 520d M Sport was £32730. As near as makes no difference the same price.
As far as residuals, according to car-buyer, the Audi has better residuals
How can that possibly be the case? You tell me the 5 Series is more expensive used - and I agree with you - but you see above that both cars were the same price new. Therefore the residuals on the Audi must be poorer or you wouldn't be telling me the BMW was more expensive used

and I could get a similar priced 5 series, but it looked naff without those options you advised me to get and with them it was more expensive than the S-line I ended up buying. I thought the S-Line was the better looking, better quality interior and better value car overall.
I admit though the deciding factor that made me choose the A6 was ultimately the dealer service, Ridgeway in Salisbury and Dick Lovett in Swindon were both dreadful, one couldn't even be bothered to let me test drive a car unless I made an appointment later in the week. Poole Audi on the other hand let me test drive pretty much anything there and then.
This is not something I really consider when buying a car. With national AUC sites there is no requirement to buy locally anyway so it matters not how polite or rude the sales team of your nearest dealer is, IMHO. I will almost certainly never walk through the doors of the BMW dealer I purchased mine from ever again, for example, simply because they are some distance from me! Once you drive away the service offered by the sales team becomes irrelevant so to base your purchase on them seems strange. Rather like not buying a Samsung TV because the guy selling it to you is a prat. Odd. Once you've got the TV you need not deal with the salesman again..
I had a choice of buying a 520 or the A6, for me the A6 was the nicer car. That is the real difference, personal choice and what you want from a car.
I still don't understand why you insisted on the 4 cylinder models - your budget was enough for a 6 cylinder and it's a real shame you didn't try one. It changes the feel of the car, my 530d is very different to my fathers 520d in some respects.
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