All used BMW's require a DIYer! Whether it be major or minor repairs, they will break your wallet. I have restored and rebuilt several 850's. They are no more expensive for parts, but the car is so electronically complicated, it requires a bit of knowledge and experience to maintain. I can never stress enough, preventative maintenance is the key, don't wait until it breaks.
Now to answer original question- Which 5 series is the most desireable. I was trolling eBay and other sites and ran across a 2006 E61 wagon. Did the research of what problems are associated with E61 from 2004 to 2010. I found the N52, 2006/2007 models were most desirable to me. Since the 2006 purchased 3 years ago, I have purchased a 2007 last year with sport package and some other options I was looking for. Fell in love with the cars and just purchased my third one- 2007 530xiT sport loaded as well.
Now what to expect-
#1- water pump/thermostat, this is a failure that will stop you in your tracks suddenly on the side of the road. Worth changing at 105k. The 2006 failed at 105,900., the 2007 failed at 147k, the new to me 2007 will get a water pump next week. It has 115k. Piece of mind!
#2- Service the transmission/filter.
#3- Check all the belt tensioners and belt as well as all hoses, etc.
#4- Make sure battery is healthy- lots of Gremlins come out of nowhere. This has been my experience many times on all models. 5 year or older battery might test good but will raise hell on the car.
#5- Replace all struts and shocks. You will definitely appreciate the "new" ride. Drive it like you stole it!
#6- Remember its a love/hate relationship!! Requires patience at times.
So, IMO- I suggest look for a 2006-2007 N52 5 Series. Motor problems are just one of the pitfalls of the newer ones. All of this is my opinion only.
Hope it helps.
Used BMW's out of warranty are cheap, but expect to invest the few thousand to bring the car up for another 100-130k miles and very dependable.
One last experience- If you don't hand wash them with a little rubbing, they feel neglected and will bite you!!
Attachment 629409 All genuine OEM BBS wheels. Kinda proud of those. The staggered on the grey one also fit the E31 850. I put the Rondells back on it.
Attachment 629415
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