What happened with your old 530 in the end? Last time I remember you posting about it was when youd been to look at or test drive an F10.
I still have it - I keep meaning to do something useful with it, its currently SORN. I never sold it when I replaced it almost 7 years ago now with an F10 as it didn't seem worth it and as an E39 enthusiast, it's still a car I love. I now have a large double garage so a project for summer is to get it all immaculate again. Part of me wishes it was an M5 so I actually had a reason to keep it all mint, but there we go. I've had it 14 years now

But 7 years ago I finally got fed up of running it as my main car. It was a case of what could go wrong this month? And invariably, something always did. A funny noise here, a vibration there, I felt like I was always ploughing cash into it to keep it running properly and the reward for this was a very nice but old car.
So, in early 2014 I replaced it with a 2010 F10 530d SE. I ran this for 2 and a half years before replacing it with a 12 month old F10 530d M Sport (The car I wanted in the first place but at that point couldn't afford).
Interestingly, I did a whole life cost comparison between my first F10 and my E39 and they both worked out at about 50p a mile all in. The F10 never cost a penny in repairs - but cost many pennies in depreciation. But the E39 cost many pennies in repairs, meaning that in the end they ended up costing about the same to run.
Moving from the E39 to the F10 meant I went from one repair bill a month to zero repair bills since 2014. I am astounded as to how reliable both of my F10's have been, even though they are much newer cars. I pay for the BMW warranty but have yet to make a claim on it with my current car, which I've now had for 4.5 years. I wouldn't imagine you'll be able to repeat that by buying a bottom of the market 10 year old F10 and I'd expect to have to budget for repairs on that, too, but I'd rather be fixing an F10 as a main car than an E39.
The E60 can, of course, go away and never return. Nasty things

The E39 now is a car for enthusiasts who appreciate what is arguably the best sport saloon BMW have ever made. For 20k a car I wouldn't have one for free, let alone pay for one. It's just not the car for that anymore. The design is 25 years old.
Mine is a 'reliable' petrol one not a complex first generation common-rail turbodiesel. The diesel ones are not even that fuel efficient - years and years ago my Dad ran an E39 530d whilst I had my E39 530i and I regularly drove it and found that it was at most about 7mpg better on average than my 530i. Not worth it.
